Yesterday as the boys (Zarf, age 10 and Klaxon, age 9) were getting their gear on for a trip to the pool, and Christmas carols played in the background...
Zarf: I don't understand. Those people who had Jesus -- how did they know he wasn't their real son?
Me: Joseph and Mary?
Zarf: Yes. How come they thought Jesus was the son of God? Couldn't he have been their real son?
Me: Yes, they...[long pause as I think of a synonym for "Virgin Birth"] had not yet attempted reproduction.
Zarf: Oh. So he was definitely God's son not their own?
Zarf: But wouldn't God need to reproduce with another god? Because he'd have to find one of his own species for reproduction to be successful.
Me: Well, there's really only ONE God. There aren't any others for him to reproduce with...and of course, we say God is a "him" or use "he," but only for convenience sake. God probably doesn't have a gender.
Zarf: Ah. So God reproduces asexually?
Klaxon: Like certain fungi!