How to manage geriatric incontinence?

If he can pee into the container and not his pants, he’s not incontinent. What do you mean by “physical aspects”? What are you asking?
The best practice is to leave the urinal where he can reach it at all times. Or alternately, you could consider a bedside commode with a bowl that slides out. You say he can walk but with difficulty. Can he lift himself from one chair to another? Does he require assistance?

What does he do at night? Are diapers an option?

This is common nursing practice. They would do the same for him in a nursing home or hospital setting. There’s nothing wrong with using a urinal. I know many wheelchair bound people who do this all the time.

Is there some other problem going on? Is he dribbling or leaking between? Is he emptying his bladder all the way or unable to fully empty it. Is she having to leave the container there all day or something? If he isn’t wetting himself, and is able to urinate in a container, then that’s ok. If he is wetting himself in between or having ot keep the container there all day, then there are better solutions. Actually I would suggest a urine bag attached to a condom shaped collector if he leaks all the time. (This is called a male external catheter). If he isn’t emptying his bladder all the way and that is leading to frequent infections, then you need to see a urologist. A bedside commode pr bed pan can be used as long as he can control his bowels. If he can’t , it’s time for depends.

He wears diapers. He can’t make it to the bathroom, if he were to try. He can lift himself with difficulty. He has help whenever he requests it.

He is not leaking all the time. He can successfully use the system as is, without much difficulty.

Then sanitation is important. If he uses a commode (portable) it is important to clean it. To sanitize whatever you dump his soiled diapers in. Check his bedding regularly as adults can leak from diapers.

It’s tough. I’m sorry that you are going through this, but be aware that it is especially hard for your grandfather, who is losing his independence.

The main thing to keep in mind is elderly people in diapers who cannot get off their bottoms much are prone to getting sores. You need to check his skin daily to make sure he doesn’t get a sore, and keep him clean and dry. If he sits for long periods make sure he has something soft to sit on, an appropriate wheelchair cushion or cushioned chair. When he lays down encourage him to spend some time on his side instead of flat on hit back and butt, so he doesn’t have pressure in one place all the time. Having damp skin and being unable to shift weight off it can lead to very painful rashes and sores. It sounds like he’s staying dry and you and your mother are taking good care of him.

k, so for now if this is working…

Check with your local hospitals to see if they are offering caregiver classes, with emphasis on the items you need help with.

diapers, and those bed covers.
make sure he stays dry.