Well do you live with your family ? Or have your own place ?

Unless your living with them why do they even need to know if you and him are seeing a marriage counselor?

If they drive by and see him or his car and ask ... it’s simple .... he’s seeing his children , since they are so young it would make sense to see them in your home.

Regardless he is either going to work hard on himself and you will see true changes and if not , then move on with your life.

Good luck