Where are Rachel’s dads?

I have loved Glee since it came on the air. I love the humor, the emotional struggles that have been shown of all of the characters, and, being a musical theater dork, I adore the musical numbers. But watching Glee last night, a question began to pound in my brain – where are Rachel’s dads?
(episode spoiler coming on)
In the show’s new episode, “Dream On”, Rachel expresses a desire to meet her mother to her boyfriend Jesse. It comes out that Rachel’s mom is the vocal coach of Vocal Adrenaline, played by Idina Menzel. This is the first time in the series that we see Rachel longing for a parental connection, one she cannot have because she was raised by her two gay dads and has no idea who her birth mother really is. Up until this point, Rachel has been kind of a Peanuts character to me: well rounded kid who seems to live her life in her room (with boys or alone) or at school. There are constant mentions of Rachel HAVING parents, but we never actually see them. So far, almost all of the main characters, Finn, Quinn, Puck, and Kurt, have had scenes with their parents, but Rachel seems to be the only one who doesn’t have any emotional one-on-ones with her parents, which strikes me as odd.
I will acknowledge that the show’s writers have done a good job with the character of Kurt, the only actual homosexual seen on the show, but it almost seems like the writers are a little gun shy of bringing up a scene of two gay men BEING GOOD PARENTS. The only evidence we the viewers have of their parenting skills is that Rachel is spoiled, and that, in my mind, shows a slightly subliminal message that homosexuals don’t make good parents. We have seen evidence from JUST ONE EPISODE that Rachel’s mom loves her very much, but is unable to see her because she signed a contract stating that she would never make contact with Rachel until she turned 18, making the slightly subtle hint that these gay dads aren’t letting Rachel meet her mom, big meanies that they are.
I hope that soon, the writers of Glee will resolve this issue. Until then, it seems, Rachel will pine for the mother that she doesn’t know, and live with the dads that never seem to be home.