Uh...about the Cara/Jance thing down there...

"Family" is a completely unknown concept to demons and angels. Most of them don't know who their parents are, and quite a few of them have spawned children with the opposite half of their parent couple. All demons refer to each other as 'cousins' and they refer to the angels as 'brothers'. (For the angels, demons are sisters; gender is another one of those oft ignored concepts.)

Of course, for second and third generations, it's a little bit different. Technically they are brother and sister, but only because they were actually born, and not spawned. (I'll define those, someday. Bear with me now, 'kay?) Genetics have nothing to do with it, and they only see each other as hated rivals for their mother and father's affection. So 'incest' is a rather harsh, and mostly incorrect term to use.

Merp. My head is swollen. *gurgling noise* I can't think straight. Le sigh.