disinherit_effect

disinherit_effect = {
	save_scope_as = disinherited
	#Rivalry
	if = {
		limit = {
			NOT = {
				has_relation_rival = $DISINHERITOR$
			}
			OR = {
				age >= 8
				AND = {
					age < 8
					$DISINHERITOR$ = {
						is_adult = no
					}
				}
			}
			OR = {
				ai_vengefulness >= low_positive_ai_value
				ai_greed >= low_positive_ai_value
			}
			NOR = {
				has_trait = craven
				has_trait = forgiving
				has_trait = content
				has_trait = humble
			}
		}
		set_relation_rival = {
			target = $DISINHERITOR$
			reason = rival_disinherited
		}
	}
	else_if = {
		limit = {
			NOR = {
				has_trait = forgiving
				has_trait = content
				has_trait = humble
			}
		}
		progress_towards_rival_effect = {
			CHARACTER = $DISINHERITOR$
			REASON = rival_disinherited
			OPINION = 0
		}
	}

	#Gain rivalry with primary heir if one of your other heirs
	if = {
		limit = {
			is_heir_of = $DISINHERITOR$
			$DISINHERITOR$.primary_heir ?= {
				NOR = {
					this = scope:disinherited
					has_any_good_relationship_with_character_trigger = { CHARACTER = scope:disinherited }
					is_allied_to = scope:disinherited
					is_child_of = scope:disinherited
				}
			}
		}
		#Rivalry
		if = {
			limit = {
				NOT = {
					has_relation_rival = $DISINHERITOR$.primary_heir
				}
				OR = {
					age >= 8
					AND = {
						age < 8
						$DISINHERITOR$.primary_heir ?= {
							is_adult = no
						}
					}
				}
				OR = {
					ai_vengefulness >= low_positive_ai_value
					ai_greed >= low_positive_ai_value
				}
				NOR = {
					has_trait = craven
					has_trait = forgiving
					has_trait = content
					has_trait = humble
				}
			}
			set_relation_rival = {
				target = $DISINHERITOR$.primary_heir
				reason = rival_disinherited
			}
		}
		else_if = {
			limit = {
				NOR = {
					has_trait = forgiving
					has_trait = content
					has_trait = humble
				}
			}
			progress_towards_rival_effect = {
				CHARACTER = $DISINHERITOR$.primary_heir
				REASON = rival_disinherited
				OPINION = 0
			}
		}
	}
	#Gain rivalry with new primary heir if your primary heir
	else_if = {
		limit = {
			is_primary_heir_of = $DISINHERITOR$
			$DISINHERITOR$.primary_title = {
				any_title_heir = {
					$DISINHERITOR$.primary_title = {
						place_in_line_of_succession = {
							target = prev
							value = 2
						}
					}
					NOR = {

As written in game/common/scripted_effects/00_interaction_effects.txt.