Apologies in advance for the long post!
I (45F) married DH (45M) nearly a year ago. Prior to our wedding I'd met the in-laws twice as lived 8 hours away. I sent birthday gifts, occasional flowers and updates as I don't have an extended family and would love that connection with them. For context DH was close to his family but has been treated as an incompetent all his life and his sibling is favoured in everything. In-laws make it a point to say DH couldn't produce offspring and SIL gave them grandkids. DH is neurodivergent and has some quirks but is by no means incompetent and is a highly skilled professional (and a nice human). DH had no boundaries with them in the past. SIL "couldn't" make it to the wedding as it was a Friday and the kids (18 & 14) couldn't miss school. They were invited to our very intimate wedding 6 months in advance, we offered to pay for their stay at a hotel, etc. SIL (and parents) was very upset we didn't change our date to accommodate her. DH and I had a significant disagreement 2 weeks before the wedding and the in-laws were quite nasty to me about it, SIL was inappropriate. DH disinvited them to the wedding. Fast forward nearly a year. I extended an olive branch as DH was too anxious to take the first step and missed his parents. He's had therapy and has learned to establish boundaries. Now MIL is demanding an apology to SIL as if we've wronged her. They also make a point of not acknowledging our son as their grandson because DH adopted him and he's biologically only mine. We recently hosted MIL and FIL and it was all superficially lovely. AIBU for thinking the in-laws add nothing to our lives?