AITA for not getting my stepsister a gift after she took $100 from me?

A 24-year-old woman returned home around Thanksgiving and brought small, thoughtful gifts for her dad’s side of the family — a mug for his wife and a simple keychain for her 17-year-old stepsister, Ina. But when she left in a hurry to visit her mom, something vanished from her backpack: a red envelope containing $500 cash and a handwritten note meant for her other stepsister.

Days later she discovered Ina had taken the money, spent $100 of it, and tried to pass it off as a gift meant for her. The woman calmly told her dad that the stolen $100 would count as Ina’s entire Christmas gift. When Christmas Eve arrived and Ina received nothing, her dad exploded — claiming she had ruined the girl’s holiday and would only make her behavior worse. Was she wrong for refusing to reward a thief?

‘AITA for not getting my stepsister a gift after she took $100 from me?’

She doesn’t hold back about her feelings toward Ina:

She returned after Thanksgiving:

This isn’t really about the Christmas gift — it’s about boundaries, accountability, and the damage caused when parents consistently shield a child from consequences. At 17, Ina is old enough to understand theft and the difference between “this belongs to someone else” and “this is mine now.” Opening someone’s backpack, reading a note addressed to another person, taking cash, spending it, and then lying about it isn’t a childish mistake — it’s deliberate.

Child and family psychologists frequently warn that when parents excuse or minimize serious misbehavior (especially involving dishonesty or theft), they unintentionally teach the child that rules don’t apply to them. This creates what experts call “external locus of control” — the belief that consequences only happen when someone else decides to enforce them. By immediately replacing the money and refusing to make Ina face real restitution, the father has already undermined any chance of natural learning.

The woman’s choice to designate the stolen $100 as Ina’s Christmas gift is blunt, but it’s also a clear boundary: “Actions have costs, and I will no longer absorb them for you.” Dr. Laura Markham (clinical psychologist and author of Peaceful Parent, Happy Kids) emphasizes that consequences should be logical and directly connected to the behavior. Here, the consequence is simple: if you take someone’s money, you don’t get rewarded by that person later.

Practical steps forward would look different if the goal were genuine change: Ina should have been required to repay the $100 (through chores, allowance reduction, or selling something of her own), followed by a sincere apology. The father could then model accountability by acknowledging his role in enabling the behavior. Until that happens, the woman is under no moral obligation to pretend everything is fine with gift-giving. Protecting her own peace and wallet while maintaining low contact is a reasonable self-preservation move — especially when love for her aging dad doesn’t mean she must accept ongoing disrespect and theft.

These are the responses from Reddit users:

The Reddit community overwhelmingly backed the OP, with nearly everyone calling him NTA and agreeing that the stepsister earned zero gift after stealing — and that the dad’s enabling is the real problem.

Most people strongly supported the OP’s decision, saying the stepsister fully deserved the consequence and that theft should not be rewarded with generosity:

A smaller group was more critical, directly calling out the stepsister’s behavior as disgusting and the father’s enabling as toxic and harmful:

A few comments added sharp humor or sarcasm to highlight how ridiculous the situation was:

Some users went deeper, analyzing the long-term psychological and relational damage caused by enabling and lack of consequences:

This story is less about Christmas presents and more about what happens when theft is excused and boundaries are ignored. By refusing to buy Ina a gift after she took money that wasn’t hers, the woman sent a very clear message: actions have consequences — even if parents won’t enforce them.

Whether you think she was too harsh or exactly right, it’s hard to argue that rewarding a thief makes sense. What would you have done in her shoes — replaced the money quietly and still bought a gift, or drawn the same hard line? Share your take (and any similar family stories) below!