Well, my youngest son must have a sign on his back....All leeches?

I am your man. He has met a young lady who does not work, has a 3 year old child by a young man and they were never married. His girlfriend's Father and her stepmother have custody of the 3 year old and the Daddy can get her and take her home, but the young lady my son is dating can only have supervised visitation. What does that tell you? Yesterday, my son called and said that he did not have enough money to buy food, so Doug and I carried them some hamburger, chicken , homemade soup, etc. Shawn had just come back from driving 20 miles away to McDonalds to get them breakfast...duhh.....While we were there, the young lady kept putting my son down, saying he was stupid that he just did not know anything about finances, and she kept on and on. He bought a lap top computer so that she could do her homework, she said that was a piece of crap. I just bit my tongue, cause I figured I was in their home. What would you have done? What can be done?