I met my DH 12 years ago, married for 7 and a half years - 2DCs. My DSis and BIL originally met around the same time I met DH but broke up about four years later for about three years. They got back together, and recently got married and have a DC. All four of us get on well. My DSis has previously (but not recently) expressed concern that I got married so young (early 20s) but not sure if this plays any part. We have 2 DBros - one has been on-and-off with his GF for 6 years but are now expecting a baby, the other has been with his fiancée for one year (no children). DSis and I are the closest of the four of us largely because we live much closer - one DBro has never met any DCs or DN, the other has met my DC1 3 times and my DC2 and DN just once. But there are plenty of messages/phone calls/video calls etc.
My DCs call all my siblings and their partners auntie/uncle except for DBro's fiancée (because they haven't been together long) but we're starting to integrate that now that they're engaged and my youngest (who isn't speaking yet) will know her as Auntie.
My DSis calls everyone DN's auntie/uncle except for my DH. I find it a bit odd, as if it may be an intentional choice to exclude him. DH hasn't mentioned anything but he's very close to DN - we were really struggling with secondary infertility when DN was born and DH spent a lot of time cuddling and playing with him as a result.
Should I raise or let it go? I've been signing things from us as auntie and uncle - should I stop using it too?