This apparently isn't real. I wouldn't be surprised if it did happen, but this story was apparently found to be false and is being spread around. Trying to find a source now.
Parents like these make me so angry. Being lesbian or gay isn't any different from being straight. I'm straight and even I know that, so what was the point in putting your 16-year old daughter who has more than likely grown attached to the people known as "mom" and "Dad" up for adoption?
So people still think heterosexual couples are the best fitted to have kids over same-sex ones?
These "parents" are a shame to humanity.
Edit: Even if this story is "fake" I've witnessed and heard numerous stories of kids being thrown out of the house because they're gay so I still stand by my comment.