My parents are coming over to stay with my wife and I for a week and I want to take them for a trip to Lanzarote to see Timanfaya, I have tried to book the 4 of us plus car on the ferry through direct ferries but it will only allow me to either book the 4 passengers as non resident or all 4 resident, short of doing 2 separate bookings does anyone have any experience in booking this trip.

Thanks
Willie