Sophie is always the one who brings critters home, so I thought she was going to end up studying them in some way, until the first time I have her a dagger. I can't get her out of the cellar now. She'll probably end up being a mercenary or a Companion. Lucia will probably attend the College of Winterhold - if she's not in my library, she's hanging out around my enchanting lab. Not sure about Blaise. All he ever does is sleep, walk around the house aimlessly and ask for allowance. I tried giving him a wooden sword and, although he seemed to like it, I've never seen him use it. I might be raising an unmotivated, mooching mama's boy for all I know. At best, he'll butter his way up the social ladder, judging by how much he likes giving me presents. Runa is going to be a member of the Thieves' Guild, I have no doubts about that.