Step-sibling family - to invite or not? AIBU?

[MysticalCat]

Every year for as long as I can remember, we've had Christmas Day at my Mum and Stepdad's with both my own sister (and her growing family) and my step-sister with her family. Other than by marriage of parents, I am not related at all to my step-sister and we are not close.

Mum is finding it too much having 15 people at hers and can't cope with cooking the dinner anymore despite us helping.....admittedly it is utter chaos. IMO 15 people is way too many and it makes for too many people to see all the gift opening activity so things get opened and I've no idea whether recipient liked it as I never saw them open it.

I'm happy to host at mine but don't want 15 people and have no interest in having my step sister and her family, we are not close and have nothing in common other than our parents are married. The suggestion of only inviting parents and my sister didn't go down too well with parents. I've suggested eating out for Christmas Day with everyone but that also didn't go down well due to financial reasons. Christmas is worse than wedding politics, lol!

AIBU? My home, my choice etc? Should I just get on with making plans for my household? Am I being rude and selfish? This crops up every year and it drags me down (not to mention Mum ending up in tears cooking dinner every year).

Sorry I'm not sure what a CF is, I'm very new, this being my third posting. Whatever it is, it seems the joke is on me.

I'm very grateful for some of the replies and suggestions, even those which have encouraged me to look at the situation again with a different viewpoint which is why I asked, but some of the comments are really very nasty and unnecessary.

To try and avoid the reader running to the hills with boredom I left out a lot of context in my original post, which, had I put it might have told the story more clearly with better context. Judging by some of the replies, I can tell I haven't done a very good job of putting enough context in the post.

I'm not afraid of hearing opinions that differ to mine hence making the post and asking for opinions but quite honestly I don't think I'll be asking much on here in future as I feel many replies have been unnecessarily unpleasant. But thank you to those who made suggestions and tried to help me.

Your name change has failed.

CF means cheeky fucker.

You've been on here since 2014, admittedly not a prolific poster but long enough to have read at least one CF thread - there's about 8 per day...

I've honestly never come across the term, I only just came back on here since the one or two posts I made back in 2014. I've updated my profile as it's been a while, it doesn't appear to have failed, not sure what's happened there then.

Not quite sure what to make of being called a 'CF'! Probably the only person who has the possible right to call me that in relation to this post is my step-sister. I've replied as soon as I got home from work so not sure what the issue is. Perhaps the etiquette is to reply straight away or to each post, my apologies. Anyway as I said I don't think I'll be hanging around as I don't need anyone calling me names.

it doesn't appear to have failed, not sure what's happened there then

It has failed, because you started the thread as MysticalCat, and your last 2 posts have been as MystyCat.

What it means is that your posts aren't highlighted to people scanning through.

I don't think you are being referred to as a CF for not replying immediately.
Posters think you are a CF for excluding your step sister after years spending Christmas together as you don't want to host many.
Imagine your SS organised the dinner next year invites your DM Dsis her DF but left you and your DC out. It is not very kind.

Thank you for clarifying the name change thing....I see that nowMaybe bad timing on my part.

We (my bio-sister and I) are pretty much always left out of my step-sisters family events. It doesn't bother me in the slightest as I respect we are all grown adults and have choices. I never added that context so you can only reply to what you've read, I realise that.