I'd feel the same, but I also have this experience & thought. I always had a job that worked 365, so my off days/holidays were not always on the calendar date and there was a fairly large extended family, so we just got together when convenient. So one thought would be to pick a date that suits everyone and celebrate then. My husband has 2 AC from his previous marriage, as do I, with 9 GC total. Plus a couple of exes--his and one of his daughter's. (My ex has flaked out & we've not seen or heard from him in years.) I've hosted holidays at our house with all of them. It felt a little weird at first, but after 4-5 holidays now, it's just normal. We just had Thanksgiving (we're in the US) at his daughter's house with us, her mother, her ex, and various others. It worked fine. Everyone is an adult and friendly.