bastard_secret_is_shunned

bastard_secret_is_shunned = {
	assert_if = {
		limit = { NOT = { exists = $TARGET$ } }
		text = "Empty TARGET was passed to bastard_secret_is_shunned!"
	}
	assert_if = {
		limit = { NOT = { exists = $TARGET$ } }
		text = "Empty PARTICIPANT was passed to bastard_secret_is_shunned!"
	}

	#Saving bastard & other parent scope
	$TARGET$ = { save_temporary_scope_as = bastard }
	$PARTICIPANT$ = { save_temporary_scope_as = participant }

	assert_if = {
		limit = { NOT = { exists = scope:bastard } }
		text = "scope:bastard does not exist in bastard_secret_is_shunned!"
	}
	assert_if = {
		limit = { NOT = { exists = scope:participant } }
		text = "scope:participant does not exist in bastard_secret_is_shunned!"
	}
	assert_if = {
		limit = { NOT = { exists = scope:bastard.mother } }
		text = "scope:bastard.mother does not exist in bastard_secret_is_shunned!"
	}
	assert_if = {
		limit = { NOT = { exists = scope:bastard.real_father } }
		text = "scope:bastard.real_father does not exist in bastard_secret_is_shunned!"
	}

	OR = {
		#Bastard child: always shunned, never criminal
		scope:participant = scope:bastard
		#Adultery is shunned
		scope:participant = {
			OR = {
				trait_is_shunned_in_rite_trigger = {
					RITE = rite
					TRAIT = trait:adulterer
					GENDER_CHARACTER = scope:participant
				}
				any_liege_or_above = {
					trait_is_shunned_in_rite_trigger = {
						RITE = rite
						TRAIT = trait:adulterer
						GENDER_CHARACTER = scope:participant
					}
				}
			}
		}
		#Either parent if incest is shunned
		AND = {
			# Can't have incest with only one parent!
			exists = scope:bastard.real_father
			exists = scope:bastard.mother

			# Also the secret participant has to be one of the parents
			scope:participant = {
				OR = {
					this = scope:bastard.mother
					this = scope:bastard.real_father
				}
				trigger_if = {
					limit = { this = scope:bastard.mother }
					scope:bastard.real_father = { save_temporary_scope_as = other_parent }
				}
				trigger_else = {
					scope:bastard.mother = { save_temporary_scope_as = other_parent }
				}
					
				# Check if the relation would be incestuous in my faith or my liege's faith
				relation_with_character_is_incestuous_in_rite_trigger = {
					CHARACTER = scope:other_parent
					RITE = scope:participant.rite
				}
				any_liege_or_above = {
					save_temporary_scope_as = liege_or_above
					scope:participant = {
						relation_with_character_is_incestuous_in_rite_trigger = {
							CHARACTER = scope:other_parent
							RITE = scope:liege_or_above.rite
						}
					}
				}
			}
		}
	}
	NOT = {
		bastard_secret_is_criminal = {
			TARGET = scope:bastard
			PARTICIPANT = scope:participant
		}
	}
}

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