Hello, eternalazer, and welcome to Psych Central! Hmmm. This situation is a tough one. Let's see.....Well, your sister is an adult. I have to say I am a bit surprised that your parents are so trusting, but again, as a mother myself I know I want to believe what my children are saying.

Are you afraid they are being taken advantage of? Well, I have to agree that they are. However, I assume they must have the money to support her, and she really knows how to pull the wool over their eyes.

Other people might disagree with me, but I'm thinking maybe you should keep quiet for awhile longer, and hope that at some future point your parents will get suspicious. As time goes by and they see she isn't making any progress, maybe they will realize that they are wasting their money--and they need to put their collective feet down about how she is spending her time.

And let's hope one day she will start maturing and/or realize that she needs help to get her act together, since it sounds like she is really wasting her life.

One thing about it, she sure wouldn't appreciate your trying to talk to her. I am assuming you are a younger sister. If you are in fact older than she is, then she might listen a bit better, though.