has_better_house_relation_with_target_house_than_other_trigger

has_better_house_relation_with_target_house_than_other_trigger = {
	save_temporary_scope_as = house_temp
	$TARGET$ = { save_temporary_scope_as = target_temp }
	$OTHER$ = { save_temporary_scope_as = other_temp }
	# If no relation with OTHER, TARGET relation must be positive
	trigger_if = {
		limit = {
			any_house_relation = {
				any_relation_house = { this = scope:target_temp }
				save_temporary_scope_as = target_relation_temp
			}
			NOT = {
				any_house_relation = {
					any_relation_house = { this = scope:other_temp }
				}			
			}
		}
		scope:target_relation_temp = {
			OR = {
				has_house_relation_level = cordial
				has_house_relation_level = friendly
				has_house_relation_level = amity
			}
		}
	}
	# If relation with both, TARGET relation must be better than OTHER relation
	trigger_else_if = {
		limit = {
			any_house_relation = {
				any_relation_house = { this = scope:target_temp }
				save_temporary_scope_as = target_relation_temp
			}
			any_house_relation = {
				any_relation_house = { this = scope:other_temp }
				save_temporary_scope_as = other_relation_temp	
			}
		}
		scope:target_relation_temp = {
			trigger_if = {
				limit = { has_house_relation_level = feud }
				scope:other_relation_temp = {
					NOT = { has_house_relation_level = feud }
				}
			}
			trigger_else_if = {
				limit = { has_house_relation_level = rivalry }
				scope:other_relation_temp = {
					NOR = {
						has_house_relation_level = rivalry
						has_house_relation_level = feud
					}
				}
			}
			trigger_else_if = {
				limit = { has_house_relation_level = quarrel }
				scope:other_relation_temp = {
					NOR = {
						has_house_relation_level = quarrel
						has_house_relation_level = rivalry
						has_house_relation_level = feud
					}
				}
			}
			trigger_else_if = {
				limit = { has_house_relation_level = neutral }
				scope:other_relation_temp = {
					NOR = {
						has_house_relation_level = neutral
						has_house_relation_level = quarrel
						has_house_relation_level = rivalry
						has_house_relation_level = feud
					}
				}
			}
			trigger_else_if = {
				limit = { has_house_relation_level = cordial }
				scope:other_relation_temp = {
					NOR = {
						has_house_relation_level = cordial
						has_house_relation_level = neutral
						has_house_relation_level = quarrel
						has_house_relation_level = rivalry
						has_house_relation_level = feud
					}
				}
			}
			trigger_else_if = {
				limit = { has_house_relation_level = friendly }
				scope:other_relation_temp = {
					NOR = {
						has_house_relation_level = friendly
						has_house_relation_level = cordial
						has_house_relation_level = neutral
						has_house_relation_level = quarrel
						has_house_relation_level = rivalry
						has_house_relation_level = feud
					}
				}
			}
			trigger_else_if = {
				limit = { has_house_relation_level = amity }
				scope:other_relation_temp = {
					NOR = {
						has_house_relation_level = amity
						has_house_relation_level = friendly
						has_house_relation_level = cordial
						has_house_relation_level = neutral
						has_house_relation_level = quarrel
						has_house_relation_level = rivalry
						has_house_relation_level = feud
					}
				}
			}
			trigger_else = { always = no }
		}
	}
	# Invalid
	trigger_else = { always = no }
}

As written in game/common/scripted_triggers/10_tgp_house_relation_triggers.txt.