Op, why is it ok for your wife's family not to gift your kids but when it comes to her son, she yells and screams about fairness. Then has the nerve to try to cut your daughters off from their grandmother and refuses to apologize to your mother. This woman is nuts and ask yourself how does she treat your kids when you are not around.

Wow, why would you be married to someone like that?

Am I the asshole for telling my wife she needs to apologize to my mother and agreeing that she won't be giving her stepson a birthday gift this time?