My question is, why is it YOUR responsibility to communicate your girlfriend's lifestyle to her father? It sounds like the girlfriend and wife initiated all of this, and you're still working out your own feelings about the whole thing.
So in my mind, it makes more sense to defer explanations to the girlfriend and wife. If the daughter explains to her father that this is her decision and she's happy with it, then he'll have no leg to stand on. If the father confronts you about it, just say "Your daughter and my wife want this and I'm still processing my feelings. I would feel more comfortable if you asked them those questions." That makes it crystal clear that you're not forcing his only daughter into some kind of harem.
“As I am sure any cat owner will be able to tell you,
someone else putting you in a box is entirely different
from getting into a box yourself.” —bisexualbaker
Last edited by SchrodingersCat; 05-19-2010 at 11:51 PM.