It IS completely insane. There are even more weird ways you could hook up that I didn't have time to list (brother to brother, sister to sister). My favorite part of this is going to be to ask liberals about whether they would favor father and son remarrying (I already had one FReeper say they asked a liberal acquaintance who was fine with it), getting a "Yes" answer, and then asking how would they feel if they did it to avoid taxes.
By redefining traditional marriage, they've opened the gates to hell. I say we shove them through it.