My sister in law makes me angry?

If she was your friend, then that makes it easier. But dont go fighting with her cos she is family and i could just lead to even worse problems! Talk to your husband and see what he thinks. She probably thinks you want to know what she does with your children.. Just tell her gently, like it is saving her a lot of trouble, that she doesnt have to tell you what she does with them.. Or else just dont let her visit them by saying your going out! X