Honestly? If my dad ever gets to the point where he has dementia and wants to end it?
You better believe I want him to have a gun. I don't think he'd ever ask me to do it, but if he did I absolutely would help him end it.
I wouldn't shoot him and couldn't unless I want to go to prison. Guns are the best way of endiing it if you're ending your own but there are better ways if someone is gifting you your death.
Drowning is a peaceful death. I'd make it look like fell overboard with the anchor rope wrapped up around his leg. I'd do it somewhere in 12' to 15' with a nice solid bottom that's weed free.....I wouldn't want him having his dying moments be with his head hurting from water pressure, or be too deep for a lot of reasons....I'd do it in the middle of a nice sunny day so when he stood there anchored to the sandy bottom totally unobstructed from weeds or being forced to touch them.....he could stand there on the bottom and look up towards the light, and not have him die where it's deep, dark, cold, and scary.....I'd make sure he died the best death possible pain free, one that would easily be written up as an accident once investigated......
.....and I'd make sure he'd have no problem looking up, seeing the light that exists on God's great earth.....and knowing to go towards it as he passes from this life to the next. If heaven exists, or any sort of afterlife, I know he'll be going to the best possible place that exists in the afterlife. My father is a Saint....the best man I've ever met, let alone been fortunate to know very well, and I'm not sure why God tested him with a shitbag of a son that I've been.....all I know is I'll never do enough in this lifetime or any other to deserve having him as my father.
Perhaps the only purpose I'm here on this earth to serve is by gaining the sliver of redemption I'll get towards making things a little more right between us my making sure he gets the good death he deserves where he's able to leave this world dignified....just like he lived his life while here.
If my dad ever needs me to help him leave this world....whenever he thinks it's his time you better damn well believe there's not a thing anyone will be able to do to get in the way of me providing him with the best fukcing death possible.
It's literally....like...literally the least I could do for him. No way my dad is dying as some poor old fukc drooling on himself, needing his diapers changed, while blankly staring at the ceiling in a nursing home.......I'll burn the entire fukcing home to the ground with him, me, and everyone else in it before I'd let anyone do that to him....same goes for my mom.