I cannot stand my my boyfriends mom!

My boyfriend has a kid with another girl and his mom basically disowns him because him and the mother of his other child do not get along and she wants to take his ex’s side over his own child’s JUST SO SHE CAN SEE THE GRANDCHILD that’s literally the only reason because his baby mom won’t let him see his kid because he moved on when he’s always been an amazing dad every time she comes back to the mother she bathed,fed changed cleaned and stimulated because she has been interacted with played with and held.hes fighting it in court and has a court date and will more than likely get 50/50 custody but over this whole thing his mom has taken the other girls side just so she can see her grandchild.she made a huge post on facebook about how she wants all her kids and grandchildren together for Christmas and didn’t tag him but tagged his ex and every single one of her other children,my boyfriend is heart broken and I hate seeing him like his,I find her very very shady.you should always have your child’s back.