I do the same with my in laws, vilify them and think they should have supported me and not him. Think they are being inhumane, but I am really making them scape goats of my anger. Remember children always come first, they are also doing exactly that for their own child. Focus on your son, he has no part to play in this but is suffering the consequences. Don’t beat yourself on how she can be so callous, I do the same it’s of no use. Shower more love on your son whenever you feel WW is not doing it.