I politely told you last week that I didn’t want to involved, I haven’t changed my mind.
You’ve sidelined your dad for over a decade , in favour of your mum.
Are you really surprised that he’s moved on with his life rather than being hung on the back of the door for you?
You can’t expect him to change his Christmas plans because yours have gone wrong. You’re an adult, act like one, the world doesn’t revolve around you.