I am glad you have the husband that you do, sounds like a great guy! I think this is completely disgusting behavior!! I cannot believe someone would want an interest free loan in order to buy themselves a new car - while your car was probably in worse shape than his current vehicle.
One question though - how did the elders find out you were getting money from your Dad twice and then your Mother? I think I would have probably kept this information under wraps in order to avoid the very thing you are talking about. No one needs to know your personal finances!!
Thanks for sharing with us, and welcome to the board!
MMO