has_any_relation_trigger

has_any_relation_trigger = {
	NOT = { this = $CHARACTER$ }
	OR = {
		# They are our liege
		AND = {
			exists = $CHARACTER$.liege
			this = $CHARACTER$.liege
		}
		# We are their liege
		is_vassal_of = $CHARACTER$
		is_courtier_of = $CHARACTER$
		is_councillor_of = $CHARACTER$

		# They are our heir/spouse/familyetc.
		is_heir_of = $CHARACTER$
		is_consort_of = $CHARACTER$
		is_close_or_extended_family_of = $CHARACTER$

		#They are the head of our faith
		AND = {
			exists = $CHARACTER$.faith.religious_head
			this = $CHARACTER$.faith.religious_head
		}

		# Other relations
		has_relation_lover = $CHARACTER$
		has_relation_rival = $CHARACTER$
		has_relation_friend = $CHARACTER$
		has_relation_guardian = $CHARACTER$
		has_relation_ward = $CHARACTER$
		has_relation_elder = $CHARACTER$
		has_relation_disciple = $CHARACTER$

		AND = {
			has_employed_any_court_position = yes
			any_court_position_holder = {
				this = $CHARACTER$
			}
		}
	}
}

As written in game/common/scripted_triggers/00_relation_triggers.txt.