I don't know what the bones can do, or what plans he has for them, but I doubt it's anything good. The daughter, at least, should be easily recognizable if you've ever seen the Fox. She looks just like him -- red hair, very pale, very pointy.

[eren's trick, at least, he won't go into detail about until he's spoken to the boy himself. it's impressive, but apparently not something he tells many people about.

her guess as to his own tricks, however, only gets a raised eyebrow. that isn't a word he's familiar with.]

I gave him a command, if that's what you mean.