Actually, I do think of that song whenever I see a Hugh Jass family like that.
I remember this one time when Catdaddy and I were at the supermarket, and we saw a large family there, with a moo and a duhd, and the kids screaming and getting in the way and all (why DO they have to bring the whole fam damily grocery shopping anyway? Can't one parent stay home with the brats while the other shops?).
I whispered to Catdaddy, "what the fuck is this, the *every sperm is sacred family?*" Then he started humming the tune. We both love Monty Python!