Sorry but your brother is wrong ! someone with an illness as bad as your sister in law needs specialist attention available at all times . They will not even get as far as the flight as no airline would allow someone with such an advanced illness to get on the plane unless the condition was declared on the booking form and a medical certificate of fitness to travel provided.
I hate having to say this but anything other than a UK holiday is virtually impossible .Your SIL could easily get worse and need to be flown home in a specialist air ambulance , this will cost £10,000s and will not be covered on the EEC medical card.



