my babies dad mother

venting well my babies dad just came to visit since we had an argument 2 months ago however he came Friday after he got off but it was late and since he has no car his mom brought him and his mom only asked if she could stay the night since it was too late for her to go back. As of Tuesday she still here and this is a problem last time we got into because he brought his brother with him. I mean she hasn't done nothing wrong but it's like when she go somewhere he goes vice versa am i wrong for wanting to tell him that when it's time to deliever she not welcome