All of these things seem a bit unrelated.
They're entirely related. You're suggesting the OP's husband may be 'trying to keep peace with his wife'. That is a misogynistic assumption. It tends to be made on the basis that when a conflict of wills arise between a MiL and her son, it must automatically hold that it's somehow the DiL's fault. It also arises from the (very) misogynistic assumption that men's place is to be henpecked and chivvied around by their partners.
The OP has stated, very clearly upthread, that it is her DH's decision to spend Christmas day this year - a one-off year - alone with his partner at their own home. The suggestion that OP is manipulating this situation from behind the scenes comes from you. It's entirely unsubstantiated, and based on biased assumption.
I work for a company that pays the same to men and women for doing the same job. Granted a lot of women earn less often because they have taken time out to care for children. They could always split the maternity period though?
The thread isn't about you. It isn't about maternity leave, either. The situation as regards a statistically-proven 'gender' pay gap is in response to the implicit suggestion in your post that men bear no responsibility for their own decisions; in reality it's the devious woman who is behind it. I claim they are not so helpless as some women would like to believe. And as clear support for that statement, I quote this little pearl: All this aside, men like an easy life - seems to me he's trying to please everyone. And failing.
QED.
My partner doesn't go skiing - are you pissed off that your partner does!
Say what? 🙄