Frank, if your grandson gets his crackpot ideas from you (not that he would!), make sure you don't get a shed. Englishmen always invent stuff in sheds, don't know what it is, but there you go. Cockerell and the Hovercraft, Barnes Wallis and the Bouncing Bomb, and I should know, but have forgotten, the chap who invented the Jet Engine (Mitchell springs to mind, but think it's wrong, as he gave us the Spitfire).
Give an Englishman a shed, and as long as he's bonkers enough, sure as eggs is eggs, he'll go and invent something.
Maud, hope both you and your Dad are feeling better. Both Asda and Tesco do a very good home shopping service on t'interweb, get yourself a coffee, do your shop, and ring for a take-away. They deliver late at night and early-ish in the morning, so should be able to fit it in around hospital visits. At least they don't think it's cancer, as it's always a worry once it's been in someone's system. Sending some positive vibes, sounds like you both need a bit of a rest!