As someone who has recently been diagnosed i have found the following gadgets useful.
First from all I have read it seems that the only thing that can slow the progress of P is keeping up a level of fitness. I have set myself a minimum target of 10000 steps a day. To measure this I have a Fitbit type watch with a step counter and if at the end of the day I haven’t got there I can go up and down the stairs until I reach my target. Watches like this are very cheap nowadays. With regard to exercise I intersperse this with more strenuous exercise when I can but each person needs to set their target according to their own health and condition. For another person the target could be 5000 steps or fewer. I would also count other activities as equivalent to steps. For example an hour’s gardening or housework I count as 5000 steps. So my first gadget is a step counter.
My second gadget is an Amazon Alexa. We have several of these dotted round our house. One of the effects of Parkinson’s is lapses of memory (for me anyway) so I have set up reminders for things such as when to put the bins out. You could also have reminders for medication etc. Another use we have for it is to drop in on our grandchildren when they have come back from school. This drop in feature could be used to drop in on someone with P who might have difficulty with a phone (although some people might find it a bit creepy to hear a disembodied voice suddenly speaking out).
Anyway hope all goes well with your uncle.