Long story short......
Every christmas me and DH take it in turns with his sister and her DH to have his mum for the day and then alternate with Boxing Day so she gets to see both families on either christmas or Boxing Day.
However, this year DH's sister is going through a break up and I said to her that she was welcome to come round with her DCs on Christmas Day if she was stuck.
I don't think she and her soon to be ex-husband have discussed the arrangements for spending time with their DCs over christmas.
Somehow, MIL has got it into her head that she (MIL and possibly SIL and her DCs) will be spending both Christmas and Boxing day at our house.
Incidentally, on Boxing Day DH will possibly be taking the children to a basketball match and they won't even be here.
How do I word it, without sounding selfish, that I just want to spend Christmas Day at my parents?
MIL has a big house.... I don't understand why she won't have her daughter and DCs at her house for one of the days!
Me and MIL get on okaaaaay but she can grate on me after a while and she can be a bit ungracious.