My mother-in-law has raided our home

My husband is an only boy and to a certain extent the relationship between him and his mother is understandable.

However she goes overboard when she calls him very late at night, expects him to spend every weekend with him.

This woman even decides what her son should wear, eat or even when we should have our next child. I even heard she's been trying to convince him to take another wife.

I can't recollect how many times we've fought over our children. She wants to raise them, claiming that they are better off with her than the maids we entrust them with all day.

I can't take it anymore; no wonder they warned us about our relatives during our pre-marital counselling.

How do I let her know that he is my only husband and my children's father just as he's her only son?