I suspect it'll be soon now that Chadric will adopt two little girls who he's found living homeless, especially the little girl who's freezing in the cold of Windhelm. Trouble is he hasn't even started on his primary homes in Falkreath yet. As a result he's probably going to choose the pleasant and relatively safe Breezehome as a temporary home for them to live with Lydia, whilst he hides out at Fort Dawnguard making new equipment and armor with his group and the Dawnguard. But once he's ready he'll want to move the kids to one of his new homes. So the simple question is, can you move your kids to another home?
Oh, also, how do you go about moving kids to a custom built home? I ask because eventually I want to build a castle for them all in Falkreath Hold.