Removed father after you make your selection - edge case where your summoned men might follow daddy to a new realm if he became employed to gained a title, leaving your court. That's obviously not intended so daddy dies.

Added a game rule, if you would prefer the summoned characters have a random culture you can turn it on.

They're related, but didn't share a dynasty? - fixed

Both a game rule (for new games) and a decision (for active games) has been added, if you would like to disable the AI from using the decision to invite.

Added their father to make them all brothers.