AITA for refusing to end being no contact with my sister to help her while she’s homeless?

A 27-year-old woman went permanently no contact with her younger sister after discovering the sister had been sleeping with her long-term partner while both were pregnant by him. The betrayal led to the end of her relationship, the termination of her pregnancy, and vicious attacks from her sister to the rest of the family. What has reignited family tension is the sister’s current homelessness with her baby after breaking up with the ex-partner.

Despite the sister’s past cruelty, their parents pressured the poster to provide help and shelter, insisting that emergencies override past wrongs—prompting her firm refusal and questions about whether she’s truly wrong for holding her boundary.

‘AITA for refusing to end being no contact with my sister to help her while she’s homeless?’

A woman ended her five-year relationship upon learning her partner had been unfaithful with her own sister.

The sister spread vicious narratives to the family while the poster cut contact completely.

Now homeless with the child, the sister turned to family for help, leading parents to demand the poster’s involvement.

Severe betrayal like infidelity with a sibling destroys trust irreparably for many, justifying permanent no-contact as a valid boundary for emotional survival. The poster’s decision to terminate her pregnancy amid the trauma adds profound personal loss, making any expectation of future aid from her understandably untenable—forgiveness cannot be demanded.

Some family members argue emergencies supersede past harm, viewing refusal as cold when a child is involved. Helping indirectly through parents or systems might preserve distance while addressing humanitarian needs. Yet forcing reconciliation risks retraumatization, especially given the sister’s lack of remorse and active vilification.

Socially, this reflects “family obligation” pressures that often excuse toxic behavior under “blood is thicker” rhetoric. Consequences for actions—like losing support networks after deliberate harm—are natural outcomes, not punishment. Enabling without accountability can perpetuate cycles, while firm boundaries model self-respect and protect mental health.

Here’s the feedback from the Reddit community:

Many users backed the poster unequivocally, emphasizing the severity of the betrayal and validity of permanent boundaries.

A couple offered practical suggestions while still affirming her stance.

Others delivered blunt humor to underscore the absurdity of the family’s expectations.

The community overwhelmingly supports the poster’s refusal—her sister’s extreme betrayal and subsequent cruelty severed any obligation, and consequences now fall on those who enabled or committed the harm. While the child’s situation evokes sympathy, it doesn’t mandate reopening wounds.

Have you maintained no-contact with family after major betrayal—did pressure from others ever make you waver? When, if ever, should “family emergencies” override unforgivable past actions?