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

Fixed the game rule category, will be in the "AI" category now.
Rather than gameplay_game_rule_category_etc insane string of words category.

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.