Would you say something ?

My friend is going through a dilemma... she and her husband have been ttc for a few years and she is constantly getting harassed by her mother-in-law and sister-in-law who keeps calling my friend a “witch” and saying that it’s my friend’s fault that their son and brother does not have a child. We live in Nigeria and over here a lot of times the woman is blamed if the couple are struggling to conceive. My friend’s mother-in-law goes as far as calling my friend “barren” and threatening to bring in another wife for my friend’s husband so the wife can get pregnant for him. Here is the thing... my friend’s husband has never cautioned his mother and siblings and he continues to allow them bully his wife! He keeps saying “just ignore them”... they have done several fertility tests and my friend’s husband is the reason why they can’t have children but yet my friend is the one being bullied by his family. I have told my friend to stop protecting a man that can’t stand up for her and that she should tell his mother the truth as it is! What would you advise my friend in a situation like this?