I lost all my grandparents that I was close to by the time I turned 20. My dad struggled with Parkinson's for the last 10 years of his life, although he had it longer than that. It got rough the last couple of years, and he passed on Feb 9th 2011. Mom's health wasn't good either, as she had open heart surgery in 1995, and had severe rheumatoid arthritis. She couldn't drive well at the time of dad's death, but by 2013 she gave it up entirely. We took her everywhere, all doctor's appts, all grocery and med runs. Eventually we just made the runs for her, and she rarely left the house. She kept getting worse, until in Feb 2016 she went into the hospital. She was either there or at rehab trying to get better to come home until she passed on May 1st 2016. I miss them both, but only how they were before their health failed. I wouldn't want either of them back if they had to deal with the suffering they were going thru.
I only tell you this so that you know where I'm coming from when I say this.... I know your pain. Death, while part of life, is difficult at best when it's someone you are really close to. Even though the pain is real, I tend to look at it as that I'm thankful for having been that close to someone in the first place. Many people are not like that, and haven't been close to anyone in their entire lives.