Requirements for both are simply being adult male.
(that's a bit messy interface - if someone has a better idea that doesn't require a lot more coding, please tell me)ĪI never does either of these things, so they're player only. That's something I've seen requested on various forums a lot, so here it is: a mod that allows anybody to adopt a vassal or courtier as their child, and to disinherit any of your children.