Just real quick... the BM of my SS's tried the same thing with daycare... telling us that her friend was going to be watching them and she would only be charging $60 a week, $30/$30, and she would provide receipts. Well we were quite fishy about BM actually contributing anything (there were also other issues with this friend), but my DH talked to the friend and worked out some issues and told BM it would be ok, but that he would need her social security number so he could claim what he was paying for CS on taxes and ... my goodness... all of a sudden this friend would do it for free! *rolling eyes*... sometimes just asking for certain information lets people know they COULD get linked to fraud... and they want no part of it.
Good luck.
Good luck.