DP and I live separately although we've been together for 15 years. We tried living together and it wasn't great so we agreed we'd all be happier living apart. It works very well.
DP has adult children who he sees regularly. One of the main reasons we don't live together was due to difficulties with the children/ex when they were smaller. Long story, loads of examples of awful bullying behaviours and incredibly unkind treatment. As a result we're all happier but I don't see the adult children at all.
Due to many reasons, Covid, elderly relatives, unwell relatives, we haven't had many Christmasses together over the last 3 or 4. This year DP is spending Christmas at mine - I was really looking forward to it. He's just told he's invited his children to come over and spend the day with us. Not unreasonable? So why does it feel like a massive damper has been put over my Christmas - I'd rather be alone TBH than spend it with two young adults and their partners who have been so horribly hurtful in the past.
I know I'm going to get firebombed. I'm not a step parent through choice. I was not involved in any way in the break up of the marriage. I fully support him needing to be a parent - I just don't want to see them on this special day. I doubt they want to see me very much either.