Thank you for your reply. Have you thought about discussing with your GP about the surgery putting a line in for a saline drip when FIL is dehydrated? It would be helpful to you both, and you would not have to send him to hospital. Most surgeries have a phlebotanist who takes blood, and they should be trained to set up a saline solution, and you already have skill with emptying a catheter.
I think that would stop a whole lot of your stress and worry.
Smelly urine is a sign of infection. I can't remember what the drug is, but it comes in powder form which is dissolved and the dose repeated 72 hours later, and it works wonders. It means FIL won't need to take antibiotic pills for a week!
What about oral care? If he is not drinking much, his mouth will be very dry, and that causes difficulty in speaking. There are synthetic saliva sprays that help. The best one is Glandosane, but it is impossible to get in the UK now. It is aerosol spray. The other sprays can sting, and deposit it in one place. If he can clean his teeth now, and wash his mouth out, he may not be able to do that in the future, so to make sure he is cleaning his mouth properly, just have a check for a second to get him used to the idea of someone else having to do that.
There are some ear drops you can buy over the counter to control any build up of wax. If you see him 'banging' his ear with his hand, it could be earache, just as when a baby does it.
The same goes for temperature check: if the back of the neck is warm, then so is he, so extra covers are not necessary.
Dry skin acts like shrink wrap over the small bones of the feet and hands and that causes nerves to be trapped between them. Make sure his skin is always moisturised, so that his feet and hands stay moveable!
Also, and this applies to all ages, keep a jar of vaseline handy for shins and elbows. Those are areas without muscle, skin on bone. The shin bone gets knocked and very often when a lump is formed, the skin splits and it can take months to heal. If you keep a jar handy and apply it immediately, the skin will stretch with the bump and not split. It doesn't have to be vaseline: if you bark your shin in the kitchen, any oil will do. Cheap supermarket petroleum jelly is as good as vaseline, and a lot cheaper. It does so much good.
There are so many Victorian tried and tested cures. Bicarbonate of Soda is a Godsend, especially for bathing and washing, yet costs so little.
What you are doing is skilled work, and I am sure you would be welcomed as a carer anywhere. Get someone else to do your housework and take a training course for a certificate. You may think you will never, ever again, but chances are you will, because there are so few who can.
If FIL prefers you to care for him, then get someone in to relieve you of other work. A vacuum cleaner weighs a ton when you are caring for an elderly person, and a lot housework chores are formidable when you are caring for someone, and you don't have to do it if you claim the benefit.
Does your doctor test the rest of FIL's family for kidney problems? Sometimes it is genetic.