[Head416]

Your sister is a crappy person. Your parents help her because she's incapable of surviving on her own. You're the reaponsible one, which means you get the short end of the stick.

Get over it. My wife has the same problem in her family. You aren't going to have your parents for much longer and it would be a shame to let this create resentment between you and them. Don't fight with them.

Also, this $12k won't be the last time they waste money on her.