We booked 4 tickets to travel from Barcelona to Nice on Vueling Airlines. Due to a health emergency, one of the passengers had to undergo surgery 5 days before the start of vacation and was put on complete bed rest for 3 weeks. The other passengers are his wife and sons. We sent in a request to be able to use the tickets within 6 months and cancel the current reservation (about a week before the flight date). We attached a note from the doctor specifying the need for cancellation. Vueling responded asking for certification of relationship of the passengers. We explained the relationship and asked what they wanted to prove it. They asked for birth certificates and marriage certificates. Due to security concerns I refuse to provide copies of these certificates. Is this normal for airlines? I thought doctor's note was sufficient. Anyone else have this experience? What can be done? we are not asking for a refund of the money but per their rules asking if we can use the tickets within 6 months.