add_bastard_trait_based_on_faith_effect

add_bastard_trait_based_on_faith_effect = {
	if = {
		limit = {
			rite = {
				rite_has_parameter = bastards_none
			}
		}
		add_trait_force_tooltip = wild_oat
	}
	else = {
		add_trait_force_tooltip = bastard
		scope:father ?= {
			random_memory = {
				limit = {
					OR = {
						has_memory_type = first_born
						has_memory_type = twins_born
						has_memory_type = child_born
					}
					any_memory_participant = { scope:child ?= this }
				}
				set_variable = bastard
			}
		}
		scope:mother ?= {
			random_memory = {
				limit = {
					OR = {
						has_memory_type = first_born
						has_memory_type = twins_born
						has_memory_type = child_born
					}
					any_memory_participant = { scope:child ?= this }
				}
				set_variable = bastard
			}
		}
		scope:real_father = {
			scope:child = {
				if = {
					limit = { has_trait = twin }
					random_sibling = {
						limit = { is_twin_of = scope:child }
						save_scope_as = child_2
					}
				}
			}
			if = {
				limit = {
					NOR = {
						any_child = {
							even_if_dead = yes
							this != scope:child
						}
						exists = scope:child_2
					}
				}
				create_character_memory = {
					type = first_born
					participants = { child = scope:child }
				}
			}
			else = {
				if = {
					limit = { exists = scope:child_2 }
					create_character_memory = {
						type = twins_born
						participants = {
							child = scope:child
							child_2 = scope:child_2
						}
					}
				}
				else = {
					create_character_memory = {
						type = child_born
						participants = { child = scope:child }
					}
				}
			}
			scope:new_memory = { set_variable = bastard }
		}
	}
}

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