My Dad Broke My Mom’s Heart When He Cheated & Had a Baby with His Mistress — Now He Demands I Use the Inheritance Mom Left Me for My Half-Sister’s Treatment

When my father betrayed our family, my mother picked up the pieces, and I stood by her. Years later, after her passing, he asked me for something unthinkable. I tried to stay neutral, but what he said next broke me.

I used to think we had the perfect family.

Dad would come home from work at 6 p.m. sharp. We’d eat dinner together and talk about our days. Mom would laugh at his terrible jokes while I’d roll my eyes and tell him to come up with better ones.

That was my world for 25 years. Then it all came crashing down.

A man sitting on a couch | Source: Pexels

A man sitting on a couch | Source: Pexels

“Julie, honey, sit down,” Mom said that awful Tuesday morning. Her eyes were red and puffy. Dad wasn’t at the breakfast table like usual.

“What’s wrong?” I asked, already feeling my stomach twist.

“Your father has been seeing someone else,” she whispered. “For eight years. And… and she has a little girl. His little girl.”

A little girl | Source: Pexels

A little girl | Source: Pexels

I couldn’t believe what I’d just heard.

Eight years? While I was visiting for Sunday dinners? While we celebrated birthdays and holidays together?

“How did you find out?” I managed to ask.

“He told me,” Mom said, taking a deep breath. “He said he couldn’t live with the guilt anymore. The woman’s name is Sandra. And the child, Mya… she’s seven years old, Julie. Seven.”

I did the math quickly. Mya was born when I was 18.

So, all those business trips Dad took, and all those late nights at the office… they were all lies.

A man sitting in his office at night | Source: Pexels

A man sitting in his office at night | Source: Pexels

“What happens now?” I asked.

“I’m filing for divorce,” Mom said firmly. “Thank God for that prenup his mother insisted on. It protects what I brought into this marriage.”

The next few months were a blur of lawyers and paperwork. Dad moved out immediately. He didn’t fight the divorce terms. Maybe guilt made him generous, or maybe he just wanted it over quickly.

Mom was incredible during that time. She never once badmouthed Dad in front of me, even though I could see the pain in her eyes every day.

A woman sitting in her bedroom | Source: Pexels

A woman sitting in her bedroom | Source: Pexels

“You can choose your own relationship with your father,” she told me. “This is between him and me. You’re an adult now.”

But how could I look at him the same way?

Every time I saw Dad, I thought about Mom crying in her bedroom. I thought about Sandra and little Mya living their secret life while our family fell apart.

I tried to maintain a relationship with him at first. We’d meet for coffee occasionally. But it felt forced and awkward.

Two cups of coffee | Source: Pexels

Two cups of coffee | Source: Pexels

“I know you’re angry,” he said during one of our meetings. “But I hope someday you’ll understand.”

“Understand what, Dad? That you lied to us for eight years?”

He had no good answer for that.

Over time, I made peace with the situation for my sake because carrying all that anger was exhausting.

I forgave him, but forgiveness didn’t mean forgetting. And it certainly didn’t mean accepting Sandra or Mya into my life.

Mom threw herself into work after the divorce.

A woman using her laptop | Source: Pexels

A woman using her laptop | Source: Pexels

She built her consulting business into something amazing. She was stronger than I ever imagined possible.

Dad, meanwhile, seemed to struggle financially. Supporting two households wasn’t easy on his salary. But that wasn’t my problem anymore.

Everything was going fine until last year, when Mom started complaining about being tired. At first, I thought it was just work stress. I thought she’d take some multivitamins and be fine.

But then came the diagnosis. Cancer.

A doctor | Source: Pexels

A doctor | Source: Pexels

The doctor told us Mom didn’t have much time left. Her cancer was aggressive, and there was not much they could do to stop it from spreading.

Three months later, she was gone. Mom lost her battle to cancer.

She left everything to me, including her house, business, and savings. Everything she’d worked so hard to build after Dad destroyed our family was now mine.

“You’re the only one who stood by me,” she’d whispered during her final days. “Promise me you’ll use this wisely.”

I promised. And I meant it.

Wads of cash in a small briefcase | Source: Pexels

Wads of cash in a small briefcase | Source: Pexels

Running Mom’s consulting firm was challenging but rewarding. I was finally financially stable for the first time in my life. I could pay off my student loans, fix up the house, and even take a real vacation.

And then Dad called.

“Julie, I need to talk to you,” his voice sounded strained. “Can we meet for coffee?”

I hadn’t heard from him in months. “What’s this about?”

“It’s about Mya. She’s… she’s very sick.”

A man talking on the phone | Source: Pexels

A man talking on the phone | Source: Pexels

Something in his tone made me agree to meet him. We sat in the same coffee shop where we used to have our awkward post-divorce conversations.

Dad looked older and more tired than I remembered. His hands shook as he stirred his coffee.

“Mya’s been in the hospital for three months,” he began. “She has a rare blood disorder. The doctors say she needs specialized treatment, but our insurance won’t cover it all.”

A doctor looking at a report | Source: Pexels

A doctor looking at a report | Source: Pexels

I felt my chest tighten. “I’m sorry to hear that. That must be really hard.”

“The treatment costs $60,000,” he continued. “We’ve maxed out our credit cards and even borrowed some money from Sandra’s parents. We’re desperate, Julie.”

I could see where this was heading. “Dad…”

“I know what you’re thinking,” he said quickly. “But she’s just a little girl. She’s your half-sister, whether you acknowledge it or not.”

“I’ve never even met her,” I said quietly.

“That was your choice,” he shot back. “Look, I’m not proud of how things happened. But Mya didn’t ask for any of this. She’s innocent in all of it.”

A girl | Source: Freepik

A girl | Source: Freepik

He was right about that. But using Mom’s money? The money she’d earned after he betrayed her?

“I can’t, Dad,” I said finally. “It’s not my responsibility. She has two parents for that.”

“We’ve done everything we can. I’m her father, Julie. And you’re her sister. Family helps family.”

“Were you thinking about family when you were cheating on Mom for eight years?”

Silence. Dad stared at me with wide eyes before continuing the conversation.

An older man | Source: Pexels

An older man | Source: Pexels

“Please,” he begged. “Can you live with yourself if she dies? Because I’ll make sure you know it was your choice.”

That last part felt like a threat. At that point, I stood up.

“I need time to think,” I said.

But deep down, I already knew my answer.

A close-up shot of a woman's eye | Source: Pexels

A close-up shot of a woman’s eye | Source: Pexels

Dad didn’t wait for my decision. He called me the next morning.

“I’ve been thinking about our conversation,” he said. “I need an answer today.”

“Dad, this is a huge decision. I can’t just—”

“Yes or no, Julie. Will you help your sister or not?”

The way he said “sister” felt like manipulation. We both knew Mya and I were strangers.

“No,” I said quietly. “I can’t use Mom’s money for this. It doesn’t feel right.”

A woman counting money | Source: Pexels

A woman counting money | Source: Pexels

There was silence for a few seconds. Then Dad spoke, and his words changed everything.

“If you don’t help Mya, don’t bother calling me again. I won’t consider you my daughter anymore.”

What the… I thought. After everything he’d put our family through, he was giving me ultimatums?

“Are you serious right now?” I asked.

“Dead serious. Choose your side, Julie. Your dead mother or your living sister.”

That’s when something inside me snapped.

A woman using her phone | Source: Pexels

A woman using her phone | Source: Pexels

How dare he pit Mom against an innocent child? How dare he threaten to disown me when he was the one who destroyed our family?

“You know what, Dad? You made your choice eight years ago when you decided to cheat on Mom. You chose Sandra and Mya over us. Don’t put this on me.”

“So that’s it? You’re just going to let her die?”

“I’m not letting anyone die,” I said confidently. “You and Sandra are her parents. Figure it out.”

“Fine,” he spat. “Then we’re done. Don’t call me. Don’t come to my funeral. You’re no daughter of mine.”

The line went dead.

A man holding his phone | Source: Pexels

A man holding his phone | Source: Pexels

Meanwhile, I just sat there and stared at my phone.

My father had disowned me for refusing to pay for his affair child’s medical bills with my mother’s inheritance. Why couldn’t he take no for an answer? Why was he so bent on making me pay for his daughter’s treatment?

An hour later, I started getting calls from my family.

First, it was Grandma.

A phone on a table | Source: Pexels

A phone on a table | Source: Pexels

“Julie, how could you be so heartless? That little girl is dying!”

Then, Uncle Mike. “Your father’s right. You’re just like your bitter mother.”

Aunt Sarah left a voicemail. “I never thought you could be so cruel. It’s just money, Julie. Mya is family.”

Each call made me upset. Everyone thought I was the evil daughter.

But then, something Mom always said echoed in my mind. “Never let anyone guilt you into betraying your own values.”

An older woman | Source: Pexels

An older woman | Source: Pexels

And that gave me the confidence to take the next steps.

First, I blocked Dad’s number. Then, I blocked Grandma’s, Uncle Mike’s, and Aunt Sarah’s.

One by one, I cut ties with the family members who thought I should honor my mother’s betrayer over my mother’s memory.

By evening, my phone was finally quiet.

I sat in Mom’s chair, holding her favorite coffee mug, and asked myself the hardest question: Did I make the right choice?

A woman holding a cup of coffee | Source: Pexels

A woman holding a cup of coffee | Source: Pexels

My hands were still shaking. My heart was still racing. But deep down, I knew the answer.

I had honored Mom’s legacy. I had protected what she’d worked so hard to build. And I had refused to let Dad manipulate me one more time.

Do you think I did the right thing? What would you have done if you were in my place?

If you enjoyed reading this story, here’s another one you might like: The point system seemed innocent enough at first. I thought it was just Mr. Reinhardt’s way of tracking who visited him. None of us realized he was meticulously documenting every minute, every call, and every act of kindness. Not until the lawyer opened the envelope did I realize my life was about to change forever.