What should I do?

This gives the Friends and Family deal a bad name. I am all for Friends and Family on FABO or other F_BO sights along with Moparts. You have the ability to see their past posts and get to know the members and find out who to trust. I would never hesitate to do F&F with Roy Riviera, Rat Rod Al, Rusty, MoparMarks, Halifax, .... However, someone with few posts would be a no-go.
The great thing about doing F&F on sites like this is that you can hold the sellers feet to the fire by calling them out in public if they try to get shady. That is the sole reason I am okay, after due diligence on my part, with it.
Calling them out is your "Buyer's Protection". Of course, try to resolve it but if it doesn't work out in the PM's then call'em out!