That's so heartbreaking. 
You'll get a lot of people offering all sort of tips, I'm not usually one to do that. 
Yet, this is one piece of information I cannot pass up on letting you know about. 
It's solid research and in this quick YouTube interview it explains it very simply (and in only a few minutes). 
Please do make time to view: 
https://youtu.be/9405FgR2Kik?si=t7ZmItmIJpr2uQzC&t=494 
(I've set it up to start at the right start time for you).
It’s vital for you and our dad to know.

P.S. 
If you do have a little more time, this might be worth viewing also, just for your own information https://youtu.be/pZeDbELYb0M?si=VZdJVWMzuNgNOLRu 

 🤖 Tracking strings detected and removed!

🔗 Clean URL(s):
https://youtu.be/9405FgR2Kik?t=494

https://youtu.be/pZeDbELYb0M

❌ Removed parts:
si=t7ZmItmIJpr2uQzC&
?si=VZdJVWMzuNgNOLRu 

 Great! Thank you. I often wondered what that was.  Usually I do remove those. I thought I only added the start time minutes for near end of video. Did not see any YouTube tracking code. 

 Actually, I see what you did. I didn't think I could remove that from middle of a start time URL. Got it! :) Thank you very much.