Question Author
Surely there is some policy however expensive that covers this type of circumstance. This is the blurb from the Post Office policies and is pretty similar to most companies
Close relatives or business associates whose health may prevent you taking the trip, are affected in a similar way. We will not pay for any claim you, or any insured person, makes that has anything to do with the medical condition of a relative or associate, if at the time of buying the policy (or booking the trip if this was later) he or she:
was receiving treatment at hospital (other than where you go to hospital for check-ups for a stable condition, at regular intervals which have been arranged beforehand)
was waiting for a hospital consultation or treatment (other than where you go to hospital for check-ups for a stable condition, at regular intervals which have been arranged beforehand)
had been given a terminal prognosis, or been told that their condition is likely to get worse in the next 12 months Media URL: http://www.postoffice.co.uk/travel/travel-insurance/single-trip-travel-insurance/pre-existing-health
Description: