Hey Chatty,
I say you turn the tables on 'em. Send them a letter something like:::

Dear cheap relatives,
"The proprietors at the blah, blah restaurant have notified me that they plan to return my check for the meal we shared at their restaurant during your recent visit. The plan is a part of their effort to eliminate the abuse of local residents by slimeball relatives. The restaurant will be resubmitting the bill to you in the amount of $65.00.
Thank you so very much for the lovely meal.
I can hardly wait for your next visit
sincerely,
blah, blah, blah.

Just imagine their faces as they read that. And if you could get some stationery from the restaurant and send them a bill. Whooee!!! You know they would call.
I smell a short story.... Maybe a sit com....

Gee, I am sooo baaaaad!!!

smile