AITA because I don’t want to meet or have a relationship with my father’s affair child?

A 19-year-old woman is facing heavy pressure from her father’s side of the family: they want her to meet and become a “big sister” to the child born from his affair—the same affair that blew up her parents’ marriage four years ago. Her dad was already emotionally distant and uninvolved long before the cheating came to light, barely showing up for her growing up.

Now that little girl is four, another baby is on the way, and the extended family insists she should “move past” her issues with him to support these half-siblings. She refuses point-blank—she feels zero connection and wants nothing to do with any of them. Is she being too harsh? The story exploded across social media, with thousands relating to her pain of being sidelined as a child while others argue the kids deserve a chance anyway.

‘AITA because I don’t want to meet or have a relationship with my father’s affair child?’

It all stems from a relationship that was already cold and distant between the woman and her father long before the divorce:

My (19F) parents divorced 4 years ago after my father's affair went public. I already didn't have a good relationship with my dad.

He was never super involved, he made minimal to no effort to be there for me, he was grumpy whenever I tried to get closer to him or bond with...

The only times we spent together was when mom pulled something together and he was emotionally very distant still.

He didn't fight for me in the divorce and I didn't ask to see him. Around a week after we found out my father had been cheating we found out...

She still maintains good contact with her paternal grandparents, aunts, uncles, cousins, and great-aunt and uncle, but skips every family party or celebration:

I still have a relationship with and spend time with my paternal grandparents, aunts, uncles and cousins and great aunt and uncle.

The only thing is I don't go to family parties or celebrations because I don't want to see my father or his affair partner and now I also don't want...

This has become a major sore spot for her father’s family:

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This is a sore topic for my paternal family. I have an aunt, uncle and cousins on my side who understand and don't expect me to fight for some kind...

But my other aunts and uncles and my grandparents are all super upset that I won't set aside my issues with my father and be a sister to his child...

They told me the child is innocent and she would benefit from having a big sister in her life. They used the argument that we could be each other's support...

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and how my father is showing a similar disinterest in her as he did in me and we could bond over having a s**itty father. When I said I didn't...

I said I would be happy to never have anything to do with her and her sibling on the way. I said it doesn't matter if my father's as bad...

They keep telling me to at least meet her and see if I feel something. They told me I should be old enough to be kind even if I feel...

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Her mom fully backs her choice:

My mom supports me 100% on this topic too. I know she might be biased in favor of me not forming the relationship but she'd support me if I wanted...

Only I don't. And I don't see that changing ever because I don't imagine wanting a relationship with someone who really don't hold a valued connection to me, because I...

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And I won't ever have a relationship with him because even if 20 years from now he became a very different person he would never be able to make up...

At the heart of this conflict is a young woman being asked to shoulder the emotional role of “big sister” to make up for her father’s lifelong neglect—the same neglect she endured as a child. Many on her dad’s side fixate on how “innocent” the little girl is and how much she needs love, yet they conveniently overlook the original innocent child who was pushed aside: the woman herself.

The opposing view usually rests on blood ties—”they’re siblings, feelings should come naturally.” Relatives hope she will create a bond so the younger ones don’t repeat her loneliness. But sibling relationships aren’t automatic just because DNA is shared; they require shared experiences, proximity, mutual desire—none of which exist here.

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Society frequently expects young women to be the forgiving, nurturing ones, especially toward children. Pressuring someone to manufacture affection purely because “the kid is innocent” can deepen existing wounds rather than heal anything. Clinical psychologist Joshua Coleman, co-chair of the Council on Contemporary Families, points out that adult family relationships—including with siblings—are voluntary, not moral obligations. When contact harms mental health, maintaining distance is a healthy, defensible choice (source: his writings on family estrangement in Psychology Today).

Practical advice: She should keep setting calm but firm boundaries with relatives, something like, “I care about you all, but this topic isn’t changing my mind. If it keeps coming up, I’ll have to step back for my own peace.” If the guilt-tripping doesn’t stop, a period of low or no contact might be necessary. Leaning on her supportive mom or even talking to a therapist could help process the old abandonment feelings—because even without wanting contact with the half-siblings, that childhood hurt can quietly affect other parts of life. Ultimately, no one is obligated to become an emotional safety net for children their absent parent keeps having.

These are the responses from Reddit users:

Social media overwhelmingly sided with her, mixing deep empathy with frustration on her behalf:

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Most commenters pointed out she was once the innocent child neglected—and now the family is simply shifting the burden from the father to her:

lun4d0r4 − YOU were innocent and would have benefitted from a FATHER in your life. .. Or have they forgotten that? ! Where was this pressure to your sperm donor...

Difficult_Jury_7455 − So they're all happy to harass you into fixing this child but none of them have thought about intervening with your father and getting him to sort. himself...

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Special_Lychee_6847 − The kid's innocent. Well. .. so are you. Tell them all to redirect their effort towards your father, by telling him not to be a s__tty father, instead...

If he's treating the kid the same way he treated you, he's probably right on track to go off with yet another family soon. Not your problem. You are not...

Plenty called out the relatives for dodging responsibility while warning she might be used:

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Adelucas − You are old enough to know your own mind. you don't have a relationship with your dad, so why would you have a relationship with his children? ......

eagerreader007 − NTA You were an innocent child that your dad didn’t care about and the very people lecturing you ‘to be the bigger person’ are the ones that raised...

writing_mm_romance − Stay away, they want a free babysitter not an older sister.

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Others broke down the age gap and circumstances, saying real sibling bonds simply aren’t realistic here:

Odd-End-1405 − NTA Even if it was not the child of an affair, what exactly are you going to “bond” over with a four year old? ...

When you graduate university, they will be in/starting elementary school. ... Your father sucks. He imploded your family. You are no obligation to help his next family.

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Dachshundmom5 − The only people who have a responsibility to kids are their parents. ... You dont owe those kids a relationship.

One person even shared from the other side:

Snow_queen12 − I was an affair baby and my brother doesn’t talk to me and honestly I don’t mind it at all. I have a baby brother already from my...

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duckieglow − NTA. I would tell that I would stop visiting them if they keep insisting on thus matter.

This boils down to childhood abandonment resurfacing, with pressure to fix an absent father’s mess by sacrificing personal peace. She never denies the kids are innocent—she just refuses to force a connection that feels empty and unnatural. The relatives may mean well, but their persistence is only widening the rift.

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What do you think? Have you ever had to draw a hard line with family over someone else’s choices? Drop your thoughts below—we’re reading every one.

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