Your sov daughters marry and go to other Sov's control. And yes, the Sov will have all sorts of great equipment, if given enough time. But spouses don't change, at all, in my games, so far. The trade off, I guess is, give them the best equipment you can - and maybe they will survive. If they survive, you may get grandkids, and some of them may join you. Downside is you may find yourself at war with that sov, and find your daughter facing you across the battlefield. That great equipment you gave her may come back to slice/pierce/bite you.
