So we shouldn't be surprised to see y'all on "Jerry Springer" soon?

The only real solution here is to put the moves on her dad.

I guess they like to Keep it in the family!

CoughBULLSHITcough

Better than having a grinding session with the sister and a one night stand with the mother

You need to either end it now or come clean with the girl.

really is your dick that big or is it your money??

Bend over for the dad and you'll be all square with the whole family. Of course, you didn't mention brothers or pets. You might have more work to do.

You didn't know the one-night stand was your future GF's sister, and you (I hope) didn't know the mother was married. So you didn't do anything wrong. I would tell your GF, but not the father, and then let sleeping dogs lie. At least you know your GF will still be hot when she's older.

The one night stand with the sister she’s going to be upset with that, but I assume both of you have had relationships before each other. I would come up with a good reason why the relationship with the sister didn’t go past 1 night. And for grinding on your girlfriends mom Unless your a stripper and your girlfriend knows about it your most likely going to get dumped.