I feel this is very, very selfish of them all.
Personally I'd be doing all I could to include you and look after you, especially at Christmas!
I've repeatedly asked my elderly parents (both living in different counties) to move nearer me and live with us / share accommodation for the very reason of pulling together and looking after eachother.
My dad has an awful lot of money, both in houses and in the bank and although is 80....has refused to set up home with me and the children and doesn't want to move near to us.
I rent and work as a nurse and the kids are lovely humans...we are quiet and thoughtful, none of us smoke and we don't have huge crowds of friends...my hobbies are cooking, gardening and garden centres ....ideal for nurturing a family yet he hasn't wanted to engage with me.
Despite this,EVERY year I host one or the other, often causing issues with my then partner and always at the expense of a simple couple of days which actually would be of great benefit to me.
I am in the process of encouraging my mum and step dad, one with mobility issues and one with dementia...to share a house with me (they would put in several 100k and I'd have a mortgage for my part ) so that I can look after them as the age.
I will willingly do this even though id wanted to.go and work in Australia..which I won't ever be able to do now.
I am horrified that your family are so selfish. I'm so sorry to say this but it's how I feel.
They could have, at the very least, discussed this with you and looked at options around the cats etc let alone what you guys will do on Christmas day etc.
Perhaps they haven't given you any thought. Please talk to them x