Can anyone help me identify these 3 cacti? I got them from my grandpa, he just moved to a nursing home with dementia so unfortunately he no longer remembers I need to repot, a lot of his plants had root rot from inconsistent monitoring due to his dementia, I have never repotted cacti before, he had cactus mix and a note with a couple other things he mixes with it, perlite, and peat moss I think… any tips would be appreciated