AITA for convincing my bf to not take guardianship of his sisters children?

One couple on the verge of engagement suddenly found themselves in the middle of a family backup plan they never saw coming. The boyfriend’s sister asked him – the youngest sibling with no kids yet – to become guardian of her two young children if the worst happened.

His girlfriend was upfront about not wanting that responsibility, citing money worries and their own future plans. He eventually sided with her and said no for now, but the sister blew up and started pointing fingers.

‘AITA for convincing my bf to not take guardianship of his sisters children?’

The whole thing started with a couple who’ve been together a few years, already mapping out an engagement this summer and wedding next year:

The boyfriend seemed open at first and asked for her thoughts:

In the end, he agreed with her and turned his sister down, leaving the door open for later:

Extra edits clarified the situation further:

At its core, this drama boils down to the clash between idealized family loyalty and the hard realities of money, emotions, and building a life together.

The sister’s choice of her youngest brother might stem from trusting he’d love the kids most, or perhaps because he’s a teacher and good with children. But skipping a direct talk with his soon-to-be wife signals she doesn’t fully see the girlfriend as part of the family yet, which fueled the current fallout.

On the flip side, the girlfriend has every right to voice her concerns. Agreeing to raise someone else’s kids is absolutely a “two yes, one no” decision. Relationship expert Esther Perel often stresses that major choices impacting both partners demand full buy-in, or resentment builds fast.

The financial red flags she raised – zero life insurance, no savings, high-cost living – are totally valid. Plenty of couples struggle when unexpectedly taking on kids without preparation. The smartest move would be for the sister to get proper life insurance, set up a trust, and pick guardians who are truly ready. Meanwhile, the couple should keep talking openly about their own family vision before tying the knot.

Check out how the community responded:

Online folks were all over the map, with plenty defending the girlfriend’s stance on protecting their shared future:

Others felt her attitude came off as selfish or lacking family warmth:

A few stayed neutral or wanted more details:

Saying no to guardianship for now stirred up serious family tension, but it also showed the couple trying to be realistic about what they can handle. Even if the sister feels hurt, pushing a massive commitment without financial backup or full agreement could backfire badly.

What do you think – if you were about to get married and faced a request like this, how would you navigate it? Does family loyalty always come first, or is it fair to put your shared future ahead?