19-year-old finds out the girl who made his school years miserable is his half-sister, and his dad wants them to bond and have a relationship

Author image for Etai Eshet
Etai Eshet • Editor
May 11, 2026 2:00 PM EDT

Finding out someone you genuinely dislike is your half-sibling is one of those life plot twists that nobody prepares you for because there is no good way to prepare for it, and also because, well, it's not something that happens! Most sibling discovery stories come with cautious optimism and tearful reunion energy. Not this one. This one comes with years of documented history and a clear memory of exactly who this person chose to be when nobody was making her.

Nobody fantasizes about finding a long-lost sibling only to realize they already found them years ago and spent the whole time wishing they hadn't.

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  • Young man in glasses and black T-shirt standing on a wooded trail surrounded by trees and greenery.
    via Zoe Graham

    Young man wearing glasses and a cap standing outdoors on a forest trail.

    Image is representative only and does not depict the actual subjects of the story.

  • My dad (44M) wants me (19M) to have a relationship with my half sister (19F) which I don't want?

    I (19M) was raised by my single dad (44M) after my mom d d when I was just over a year old. They had been on and off for years and both slept with other people.
    via ThrowRALife4urs
  • Before I was born my dad wondered if he got this other woman pregnant but she told him her husband was the father and that the dates did not line up with him being the father. He believed
    via ThrowRALife4urs
  • her because her husband backed her up. My dad didn't see them much until a few years later when I went to school with their daughter (19F) who turned out to be my half sister after all. But we didn't find out until 2.5 years ago.
    via ThrowRALife4urs
  • I knew my half sister from school years before we found out and we hated each other. She bu ed several kids in our class throughout school and she tried to buy me but I would tell teachers
    via ThrowRALife4urs
  • everything she said and did. I even went to the principal when she would say things. She always defaulted to the fact I had a de d mom and my mom didn't want me so bad she would rather di than
    via ThrowRALife4urs
  • raise me. The fact I never hid it out of fear made her hate me more and I just thought she sucked as a person. When were in middle school she targeted me even worse because her parents
    via ThrowRALife4urs
  • Young man in glasses and graphic sweatshirt posing outdoors against a dark wooded background.
    via Aiden Craver

    Young man wearing glasses and a cap standing in front of a dark forest background.

    Image is representative only and does not depict the actual subjects of the story.

  • divorced and her dad abandoned her. She treated everyone worse but it made her come for me more for having a de d mom and made her buy these two other girls in our grade who had g y dads. She
    via ThrowRALife4urs
  • was ruthless with them and one transferred to a different school because of her.
    via ThrowRALife4urs
  • My dad offered to transfer me out too but I wanted to stay with my friends and really didn't want her to chase me off. I hated her but I wasn't scared of her.
    via ThrowRALife4urs
  • Her mom told her two years ago why her dad left and that my dad was her dad. She told me and I didn't believe her but told my dad.
    via ThrowRALife4urs
  • He confronted her mom which was when everything came out in the open. My dad did a DNA test which proved she was his and pretty much from there things got uncomfortable. I still hate her. She
    via ThrowRALife4urs
  • did for a while and got worse with the mom comments and then she wanted me to be her brother and she wanted us to be a family. My dad was getting to know her which I was okay with. But eventually he
    via ThrowRALife4urs
  • wanted me to try to make a sibling relationship work. I said no. He offered me therapy to figure it out but I told him I didn't need therapy to know how I feel.
    via ThrowRALife4urs
  • When we graduated she got again toward me because my dad refused to be with her mom again to be an official family. He never forgave her mom for lying about
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  • her being his. But she ended up coming around again because her mom found a new guy and I don't think they really talk now.
    via ThrowRALife4urs
  • My dad wants us to be a close family of three or for us to try and be. But I don't want her in my life. I spoke to her twice for dad and she made excuses for
    via ThrowRALife4urs

  • Spending your school years mocking a kid for not having a mother, escalating after your own family fell apart, and driving another student to transfer schools entirely is not a rough patch. It is a pattern, and patterns matter when someone is asking you to open your home and your life to a person you watched operate that way up close.

  • how she was and she said she was just a kid. I told her we're the same age so she doesn't get to use that as an excuse. Because
    via ThrowRALife4urs

  • She was just a kid does not land when both people are the exact same age. He lost his mother before he could form a single memory of her and still managed not to spend his adolescence targeting grieving kids and children with gay parents. Using childhood as a defense requires the other person to not be standing right there as a direct counterexample.

  • she got upset about being rejected by another family member, my dad really started to appeal to me to try.
    via ThrowRALife4urs
  • I still just don't want to. I honestly hate knowing we're related. But I accept I can't do anything about it. What I can do is decide whether we have a relationship or not and I don't want one. I
    via ThrowRALife4urs

  • His dad's position makes complete sense from where his dad is sitting. He found out he has a daughter, he wants to build something real with her, and having his kids form a relationship would make the whole picture feel more whole. That is an understandable thing to want. It just requires his son to override years of firsthand experience and extend warmth he does not feel toward someone whose change in attitude arrived at the same time her other family options dried up.

  • don't want to give her a family who won't leave her because I just don't like who she is as a person. She's a bu y and she could change some day but it doesn't change how I feel about her.
    via ThrowRALife4urs
  • I'm wavering because I love my dad and I want some advice because I feel like my dad is too close to this and my extended family won't ever tell me to do this if I don't want to and they all know (both sides) that I don't want to do this.
    via ThrowRALife4urs

  • Biology creates a fact, not an obligation. He already tried twice out of love for his father and both attempts went sideways. Loving his dad deeply and refusing to manufacture a sibling bond with someone he does not trust or like are not contradictions. A relationship built entirely on pressure and guilt, with someone who has given him no real reason to believe things are different, is not a family. It is just an arrangement nobody asked for dressed up as one.

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brother siblings relationships dad sister half siblings
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