So raging at his mum.
I don't believe how much she showers her other children and pays so little attention to him.

Just regarding Christmas:
Firstly, she was planning to go away for Christmas. All fine and good. We tried to make a time to catch up before Christmas, but she 'would let us know'.
Then, next I know, all three OTHER children are going to her house for Christmas. My fiancee receives no invitation.
Then, on Christmas day, she was going to meet us at a party... We go to party and wait and wait and she never shows up, assumably had gone home without telling us or anyone else her movements.
Then today (2nd January) she picks up his sister from our house without saying hello or interacting with us in anyway.

How does anyone get this rude and selfish?