Hi,
I was interested to know what peoples opinions are on this, genuinely, so please feel free to be as honest as I know you ladies can be 
Dp has two lovely kids (13 & 15), I get on very well with them, and we have them 3 / 4 night per week, (obviously DP would like it to be more). I was not the OW but we've been together more than 5 years now. (They've been split more than 6).
Every year when Christmas contact is arranged the following rules apply (dictated by DPs ex) - the children spend every Christmas Eve with their mother so they wake up with her and whoever she's with at the time and every New Years Eve the kids are with us so she can go out on the piss
IABU to want DP to have at least one Christmas Eve with his kids? (To be honest I'm not that bothered about NYE as we wouldn't be going out anyway).
Merry Christmas!