should_mother_give_house_to_bastard_trigger

should_mother_give_house_to_bastard_trigger = {
	#Also governs the "should_mother_give_house_to_bastard" scripted rule
	trigger_if = {
		limit = { NOT = { exists = mother } }
		always = no
	}
	trigger_else_if = {
		limit = { NOT = { exists = mother.house } }
		always = no
	}
	trigger_else_if = {
		limit = { NOT = { exists = father } }
		always = yes
	}
	trigger_else_if = {
		limit = {
			real_father = { is_ruler = yes }
			mother = { is_ruler = no }
			exists = real_father.house
		}
		always = no
	}
	trigger_else_if = {
		limit = {
			real_father = { is_ruler = no }
			mother = { is_ruler = yes }
			exists = mother.house
		}
		always = yes
	}
	trigger_else_if = {
		limit = {
			mother = { NOT = { exists = house } }
			exists = real_father.house
		}
		always = no
	}
	trigger_else_if = {
		limit = {
			real_father = { NOT = { exists = house } }
			exists = mother.house
		}
		always = yes
	}
	# making the default behavior explicit if no other trigger_(else_)ifs are valid
	trigger_else = {
		always = yes
	}
}

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