I have two SIL. My brother’s wife, and DH’s sister.
Brother’s wife is lovely, although they live far away so don’t see them much, but she’s a wonderful person & I am proud to have her in my family.
DH’s sister lives close by. I’ve tried to be friendly but it’s not reciprocated and I really don’t get the impression she likes me. We’ve both recently had our first children & I think it would be nice if the cousins could have the opportunity to be friends, which is probably why it bothers me so much.
Also I’ve come to live in the area where DH grew up and am many miles away from my own family and friends so it would be great to have a friendly relationship with SIL. But I guess that’s not the case & accept she’s entitled to dislike me / not want to become friends for whatever reason.
What relationship do you have with your SIL? If not great, have your kids still managed to be close cousins?