I hope this link work. It’s a 5 in 1 Jar Opener on Amazon. Also a flat screwdriver to start cans with pull tabs and an adjustable pliers to open bottles. Black And Decker Lids Off electric opener. Sharp but small scissors that are easy to pull open. Put it all in a basket that can sit on a stair without tipping so he can let go while carrying things up stairs. Bonus if it has sections to hold a drink (and a bottle!) without tipping. Obviously something he can put out of reach of the boys. I’ve had RA for 30 years. DM me if you want more ideas!

https://www.amazon.com/dp/B077XYYSZL/ref=cm_sw_r_cp_api_i_A5d3DbWE0CS6H