AITA for threatening to not attend my sister’s wedding?

A 29-year-old woman raised her younger sister after their mother’s emotional collapse following the sister’s type 1 diabetes diagnosis at age 6. Acting as parent more than sibling, she sacrificed much of her childhood. Now, the sister is engaged to the woman’s ex-boyfriend, who cheated multiple times and stole money from her during their relationship.

Despite knowing the history, the sister insists her fiancé has changed and has pressured the woman for months to buy him a wedding gift as a “symbol of acceptance into the family.” Refusal led to accusations of bitterness and selfishness, culminating in the woman threatening to skip the wedding—a threat that devastated her sister and mobilized unsupportive extended family.

‘AITA for threatening to not attend my sister’s wedding?’

Early family trauma forced the older sister into a parental role from childhood.

The fiancé’s past betrayal added deep hurt to an already strained dynamic.

Disapproval turned into ongoing pressure for forced acceptance.

This deeply layered conflict stems from parentification in childhood, where the older sister assumed adult responsibilities far too young, creating an imbalanced dynamic that persists. The sister’s choice to date and marry the ex—who not only cheated but committed theft—disregards profound past harm, prioritizing her narrative of his “change” over validated trauma.

What intensifies the pain is demanding symbolic gestures like gifts, framing refusal as selfishness despite a lifetime of self-sacrifice. The threat to skip the wedding, while emotionally charged, asserts long-overdue boundaries against forced reconciliation. Opposing views might label it manipulative, arguing family events warrant presence regardless. Yet, attendance isn’t obligatory when it requires endorsing betrayal.

Societally, survivors of infidelity and theft deserve space without accusations of bitterness. True reconciliation demands accountability from the wrongdoer, not gifts from the victim. Low or no contact often protects mental health in such unbalanced relationships.

Take a look at the comments from fellow users:

Many users strongly supported the poster, outraged at the entitlement and lack of gratitude.

Several suggested petty gifts or highlighted the sister’s poor judgment.

Others advised boundary-setting or weaponized compliance.

After years of parentifying herself for her sister, the woman faces demands to welcome—and gift—her cheating, thieving ex as family. Her threat to miss the wedding came amid accusations of selfishness, drawing criticism from relatives. The community resoundingly affirmed her right to boundaries, decrying the sister’s ingratitude and entitlement.

This raises tough questions about loyalty versus self-protection. Should past sacrifices obligate attendance at events celebrating painful reminders? Is refusing contact with a wrongdoer “bitter,” or healthy? Have you set boundaries with family over unacceptable partners—what fallout ensued? Would you attend if roles reversed, or support the sibling’s choice unconditionally? Share your perspectives below.