Re: Angelic Families
I had a twin brother, and he had two children.
"Brother" and "sister" could have been used for actual siblings, or it could have been used for others of one's same choir. Those of different choirs, as far as I know, tended to call each other "cousin" -- though I'm not entirely sure that's correct. If that is the case, it got really interesting when angels were in more than one choir; for example, I was in two that I know of, and some angels got confused as to what they should have called me.
Magnificat anima mea Dominum!