return_ward_travel_effect

return_ward_travel_effect = {
	if = {
		limit = {
			is_foreign_court_guest = yes
			exists = liege
			host != liege
		}
		show_as_tooltip = { return_to_court = yes }
		location ?= { save_scope_as = starting_location }
		if = {
			limit = { exists = scope:educator }
			set_variable = {
				name = guardian_educated
				value = scope:educator
				years = 3
			}
			set_variable = {
				name = guardian_educated_realm
				value = host.primary_title
				years = 3
			}
		}
		# Actually return guardian last
		hidden_effect = {
			set_location = scope:starting_location
			start_travel_plan = {
				destination = liege.capital_province
				on_start_on_action = on_ward_depart_for_home
				on_travel_planner_cancel_on_action = on_ward_depart_travel_planner_exit
				on_arrival_on_action = on_ward_arrive_at_home
				on_arrival_destinations = last
				return_trip = no # One way
			}
		}
	}
}

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