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

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He Cheated. She Rebuilt. I Chose.

I used to believe we were the perfect family.

Dad always came home at exactly 6 p.m. We’d eat dinner together, laugh at his terrible dad jokes, and talk about our day like we were in one of those happy TV families. Mom would chuckle and shake her head, and I’d groan, “Come on, Dad. That one was so bad.”

That was my life for 25 years. That was my world… until it shattered in a single morning.

It was a Tuesday. I remember the silence in the kitchen. The chair Dad usually sat in was empty. Mom stood at the stove, but she wasn’t cooking. Her eyes were red and swollen.

“Julie, honey, sit down,” she said softly, barely holding it together.

I froze. My stomach dropped. “What’s wrong, Mom?”

She looked straight at me. Her lips trembled. “Your father… he’s been seeing someone else. For eight years. And… she has a little girl. His little girl.”

Everything around me blurred. I blinked, thinking I must’ve misheard her.

“Eight years?” I asked, my voice barely above a whisper. “He’s had a secret family… this whole time?”

She nodded slowly, like it physically hurt. “Her name is Sandra. The little girl’s name is Mya. She’s seven, Julie.”

Seven. That meant Mya was born when I was eighteen. While I was in college. While we were still going on family vacations and celebrating holidays like nothing was wrong.

I felt sick.

“All those ‘business trips’… the late nights at the office?” I said.

“All lies,” Mom whispered.

“What happens now?”

“I’m filing for divorce,” she said, voice sharper now. “Thank God his mother insisted on a prenup. It protects what I brought into this marriage.”

And just like that, the life I thought I had was gone.


The next few months were chaos—lawyers, signatures, boxes packed in silence. Dad moved out immediately. He didn’t fight the divorce. Maybe guilt made him generous. Maybe he just wanted to move on with Sandra.

But Mom? She was a warrior. She never badmouthed Dad, not once. Even when her heart was clearly breaking.

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

But how was I supposed to look him in the eye?

Every time I saw him, I imagined Mom crying behind a closed bedroom door. I pictured him with Sandra. With Mya. Living two lives.

Still, I tried. We had coffee every few weeks. It was always tense.

One day, he looked at me and said, “I know you’re angry. But I hope someday you’ll understand.”

“Understand what, Dad?” I snapped. “That you lied to us for almost a decade?”

He didn’t respond. Just sipped his coffee and stared at the table.

Eventually, I let go of the anger—not for him, but for me. Carrying it was like walking with a brick in my chest.

I forgave him. But I didn’t forget. And I definitely didn’t accept Sandra or Mya into my life.


Mom rebuilt her world. She threw herself into her consulting business, turning it into something powerful and respected. She glowed with confidence. I’d never seen her so focused.

Meanwhile, Dad was clearly struggling. Supporting two households drained him. But that wasn’t my concern anymore.

Things were going okay—until last year.

Mom started getting tired. At first, we joked that she was just “getting old.” But then she began skipping meals, sleeping too much, and losing weight.

We got her checked out. And the news crushed me.

Cancer. Aggressive. Not much time left.

She lasted three months. And then she was gone.


She left me everything—her house, her business, her savings.

“You’re the only one who stood by me,” she whispered one night, just before she passed. “Promise me you’ll use this wisely.”

I promised. I meant it with all my heart.

Running her business was hard, but I did it. I paid off my student loans. I renovated the house. I even went on a short vacation for the first time in years.

Then one day, my phone rang.

It was Dad.

“Julie, I need to talk,” he said. His voice was shaky. “Can we meet for coffee?”

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

“It’s about Mya… she’s very sick.”

Something in his tone made me agree to meet.

We sat at the same café where we’d once tried to play happy family. But this time, he looked older. Tired. His hands trembled as he stirred his cup.

“Mya’s been in the hospital for three months,” he said. “She has a rare blood disorder. The doctors say there’s a treatment, but the insurance doesn’t cover it.”

My chest tightened. “I’m… sorry to hear that.”

He looked me in the eyes. “The treatment costs $60,000. We’ve maxed out everything. Credit cards, loans… Sandra’s parents helped, but we’re desperate.”

I could feel where this was going.

“Dad…” I began, already feeling the answer form in my gut.

“She’s just a little girl,” he said. “She’s your half-sister, whether you like it or not.”

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

“That was your choice,” he said sharply. “Look, I messed up. But Mya didn’t ask for any of this. She’s innocent.”

And she was. But still—he was asking me to use Mom’s money. The money she earned after he blew up our family.

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

“We’ve done everything we can,” he said, voice breaking. “I’m her father. And you… you’re her sister. Family helps family.”

I looked at him, the man who once tucked me in every night.

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

He went quiet.

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

That… felt like a threat.

I stood up. “I need time to think.”

But I already knew the answer.


The next morning, he called.

“I’ve been thinking,” he said coldly. “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?”

He said “sister” like it was supposed to mean something. But we were strangers.

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

There was silence. Then he said something I’ll never forget.

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

I blinked. “Are you serious?”

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

That was it. The moment everything inside me snapped.

“How dare you?” I said. “You chose Sandra and Mya years ago. 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, keeping my voice calm. “You and Sandra are her parents. Figure it out.”

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

And he hung up.


An hour later, the storm hit.

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

Then Uncle Mike: “You’re just like your bitter mother.”

Aunt Sarah left a voicemail: “It’s just money, Julie. Mya is family.”

Each word cut deep. But then I remembered what Mom used to say:

“Never let anyone guilt you into betraying your own values.”

So I made my choice.

I blocked Dad. Then Grandma. Then Uncle Mike. Then Aunt Sarah.

One by one, I cut off the voices that tried to twist guilt into obligation.

By evening, the phone was finally quiet.

I sat in Mom’s favorite chair, holding her old coffee mug. My hands were shaking. My heart was racing.

But deep down, I knew I did the right thing.

I honored my mother.

I protected what she built.

And I refused to let the man who broke us once… break me again.