SIL to be guardian of DC after my death - but we don’t get on!

[BIAx3]

Neither dP or me have much in the way of family or long standing friends who are able to take on kids if anything happens to us

Currently reviewing wills and realise that we need to nominate someone … in case

dP has a sister he is close to but I am not . She’s a bit of a cold fish when it comes to me but v kind to the kids. In theory

She lives and works abroad half the year so we actually only see her for 2 / 3 weekends a year , Max !! Even less recently

She gets on with the older kids - but not surprise babba who came along 4 years ago and she has hardly seen

But she is the only one we can nominate realistically

She a d DP get on brilliantly but not so much she and me

I feel like we need to fix our relationship - in case
But if I am dead , will it matter ?
DP and I aren’t exactly alike and differ on most stuff, and the kids and I have nothing better in the table

aIBU?

We never had anyone nominated. (Well, my sister was in mind until she said she would take 2 out of the 3!).
Mercifully the oldest 2 got to 18 so they are nominated guardian for the youngest.
You have someone. Do it and then don't give it a second thought

A guardian in your will is for worst-case scenario planning. And an aunt who loves the children- even if the relationship is not super close - is much better than no one at all. Don’t overthink this one. If you had objections to her on the grounds of treating the children badly, her views or lifestyle, that would be different. But if it’s just that she’s not that close to you, but is to her brother, there’s nothing really to object to.

Why is she only treating the middle boy and why do you mention whichever kid is in favour? This does not suggest she is willing to do right by the kids at all