I know this seems really petty but I'm hormonal feeling really down about this, but at the same time won't change as I like seeing my family.
No one in my family meets altogether unless it is my house for dinner. They (dps, dsis and dbro) all say that "we need a get together" but then all wait for me to offer a day in my house. I actually really love them all and want a good relationship, growing up we were very close to our cousins as DM and her sister were best friends so always took turns to host things and we saw a lot of our cousins. My siblings NEVER invite any of us together, although they have bigger houses than me. My DM doesn't really cook any more but will make something light if dbro and his family visit her, but she will never do this for me or dsis 
I suspect dsis (who is really dstepsis) has anxiety and that might be why she never invites anyone, but is very pleased to come to mine.
I feel really sad as my cousins have a very close relationship with their parents, they have all taken turns hosting each other over the last few days (they are a bubble) and I really long for that. Dstepdad is quite an odd person and likes them to be on their own, so they are having Xmas alone and he is thrilled about that. We usually go away for Xmas so I'm not referring to Xmas day, I mean in general throughout the year. If I don't invite them we will never see each other. Can anyone else relate?