You will need to enlist the help of your TD with the bank, and you must make a good case for the bank to make the transfer over as it is affecting your father in law health, also it would make more sense for the bank refused to entertain a Deed of Transfer of the mortgage over to young member of the family that are working and has the years ahead of them to pay the mortgage. You father in law retirement and pension fund is for him and his wife to retire on, as they will be not working anymore.
Has your father in law bank said that they will not make the transfer over to the son?
Has your father in law bank said that they will not make the transfer over to the son?