mpo_can_be_blood_brothers_trigger

mpo_can_be_blood_brothers_trigger = {
	#If one is a child, the other must be a child
	trigger_if = {
		limit = {
			$CHARACTER_1$ = {
				is_adult = no
			}
		}
		$CHARACTER_1$ = {
			is_adult = yes
		}
	}
	trigger_if = {
		limit = {
			$CHARACTER_2$ = {
				is_adult = no
			}
		}
		$CHARACTER_2$ = {
			is_adult = yes
		}
	}
	#They can't be related enough to be allies
	NOR = {
		#Ruler is married to other ruler.
		$CHARACTER_1$ = { is_spouse_of = $CHARACTER_2$ }
		#Ruler is relative of other ruler
		$CHARACTER_1$ = { is_parent_of = $CHARACTER_2$ }
		$CHARACTER_1$ = { is_grandparent_of = $CHARACTER_2$ }
		$CHARACTER_1$ = { is_great_grandparent_of = $CHARACTER_2$ }
		$CHARACTER_1$ = { is_child_of = $CHARACTER_2$ }
		$CHARACTER_1$ = { is_grandchild_of = $CHARACTER_2$ }
		$CHARACTER_1$ = { is_great_grandchild_of = $CHARACTER_2$ }
		$CHARACTER_1$ = { is_uncle_or_aunt_of = $CHARACTER_2$ }
		$CHARACTER_1$ = { is_nibling_of = $CHARACTER_2$ }
		$CHARACTER_1$ = { is_sibling_of = $CHARACTER_2$ }
	}

	# We can't do most of the standard checks for can_set_relation_best_friend_trigger, but we do the relevant ones individually.
	custom_tooltip = {
		text = make_blood_brother_interaction.tt.already_blood_brothers
		$CHARACTER_1$ = {
			NOT = { has_relation_blood_brother = $CHARACTER_2$ }
		}
	}
	trigger_if = {
		limit = {
			NOT = {
				$CHARACTER_1$ = { has_relation_blood_brother = $CHARACTER_2$ }
			}
		}
		custom_tooltip = {
			text =  make_blood_brother_interaction.tt.actor_has_blood_brother
			$CHARACTER_1$ = { num_of_relation_blood_brother = 0 }
		}
	}
	trigger_if = {
		limit = {
			NOT = {
				$CHARACTER_2$ = { has_relation_blood_brother = $CHARACTER_1$ }
			}
		}
		custom_tooltip = {
			text =  make_blood_brother_interaction.tt.recipient_has_blood_brother
			$CHARACTER_2$ = { num_of_relation_blood_brother = 0 }
		}
	}
	trigger_if = {
		limit = {
			$CHARACTER_1$ = {
				is_at_war = yes
			}
		}
		$CHARACTER_1$ = {
			NOR = {
				is_at_war_with = $CHARACTER_2$
				custom_tooltip = {
					text = make_blood_brother_at_war_with_recipient_ally
					any_war_enemy = {
						is_allied_to = $CHARACTER_2$
					}
				}
			}
		}
	}
	trigger_if = {
		limit = {
			$CHARACTER_2$ = {
				is_at_war = yes
			}
		}
		$CHARACTER_2$ = {
			NOR = {
				is_at_war_with = $CHARACTER_1$
				custom_tooltip = {
					text = make_blood_brother_at_war_with_actor_ally
					any_war_enemy = {
						is_allied_to = $CHARACTER_1$
					}
				}
			}
		}
	}
	#Can only do intergender if gender laws are equal or both are rulers
	trigger_if = {
		limit = {
			OR = {
				AND = {
					$CHARACTER_1$ = {
						is_male = yes
					}
					$CHARACTER_2$ = {
						is_female = yes
					}
				}
				AND = {
					$CHARACTER_2$ = {
						is_male = yes
					}
					$CHARACTER_1$ = {

As written in game/common/scripted_triggers/mpo_scripted_triggers.txt.