18-year-old woman “abandons” her father’s affair partner’s 5-year-old son, she refuses to attend his birthday party and grandparents guilt her for it: “We don’t like who you’re becoming”

I have no idea what it's like to grow up with infidelity as a part of your story. Not that it happened directly to you, not that someone cheated on you, or you cheated on them, but that it was a major life theme for you, either in parents or other relationships that are just as important. Seeing your parents fall out of love and get divorced is one thing, but seeing a parent cheat on your mother or father creates its own chaos of confusing feelings. It's something that's tied to your story, your background, and that will affect you forever. You have to understand that sort of heartbreak from a perspective that's all too tender. You have to see your parent grieve, and have to cope with the identity crisis of a parent being someone you never thought they would be.

18-years-old is old enough to understand these kinds of things in life. You see things for what they are, and you can make appropriate decisions going forward. Some people may choose to not speak to their parents for cheating, some may have a strange empathy towards them.

In the story below, the protagonist has no empathy. She's absolutely disgusted by the idea of what her dad did, and wants to have nothing to do with him or his affair partner. She especially doesn't want to be involved with her 5-year-old son, and she has no obligations to.

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AITA for defending my right to skip a birthday party for my dad's almost stepkid and for insulting his affair partner?

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Even though she's 18, she seems wise beyond her years. She knows her boundaries, she knows what she deserves, and she can see right from wrong. It's strong of her to break off from him like she did. For her to distance herself from him, and not let his girlfriend's guilt tripping affect her. It's emotionally manipulative to make this young girl feel like she's in any way responsible for some kid she has no obligation to.
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18-year-old woman “abandons” her father’s affair partner’s 5-year-old son, she refuses to attend his birthday party and grandparents guilt her for it: “We don’t like who you’re becoming”

AITA for defending my right to skip a birthday party for my dad's almost stepkid and for insulting his affair partner?

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