I have a regular human sim who's married to a genie. The day the regular sim brought the blue baby home from the hospital, the father rolled up the wish to have a pillow fight with the baby. Er, what? Smack a BABY with a pillow? I guess genies don't learn a whole lot about normal life inside those lamps.
I also had a vampire gnome materialize inside my house the night before the baby was born. So, we have one pregnant human sim and one non-pregnant genie sim. No vampires in the household. The genie had recently made friends with a vampire at a party, though.
My sims had the usual problem of not getting wedding presents but still having to write thank-you notes for the gifts they didn't get. The weird thing was, they got two batches of thank-you notes to write. And when the human sim wrote the notes, the genie's charisma went up; when the genie wrote them, the human's charisma went up. Um, what? Yes, they ARE married, but that's not the same as being the same person. Weird.