I have two adult dc and two child dc. We are all renting a villa this summer with both adult dc partners too. Dc 1 and his partner live abroad so they are flying separately and meeting the rest of us there. Everyone has paid for own flights , we booked the villa. Now looking at transfers as Dc1 is comin separately I assumed they would sort themselves out and we would pay for a transfer for the rest of us. Dc1 is upset as he and his partner are not high earners so feels it's unfair if adult Dc 2 gets a free transfer with us simply because he's not travelling with us. He suggested Dc2 and partner wait at airport and they travel together and split cost. Dc2 would prefer to come on our transfer. Is it fair that Dc 1 pays and Dc2 doesn't? Or should I insist Dc2 contribute? Dc 1 is a lower earner. Dc2 is still at university