Proper strains for medicinal help

Question on strains. I have a brother in law who is suffering from something not parkinsons, but is a neural muscular disease. He’s in therapy daily, has muscle pain and cramps and is hurting all the time.

He doesn’t smoke but can and does use gummies and the pain cream. Have made some gummies with GSC Extreme at 7mg per dose that he says helps him sleep. Also made some pain cream the consistancy of facial cream with Runtz which helps with pain and soreness. Nothing seems to help the cramping.

The question is what strain would be the best to help him the most? Not well versed in how terpenes have different affects, and also not sure about Sativa vs Indica. The stains i have are GSC Xtreme, Runtz, Bruce Banner, Blue Dream, and White Widow.

Just want to help this guy out. Any help or there I’ll be very grateful.

Thanks in advance all.

Thx man. Appreciate the assistance

Having a high CBD and low THC base would potentially help.

CBD tends to contribute more for pain management vs the latter which is more so relatable to feeling “high”.

With strains speaking from personal use (i have nerve damage in my back, two blown knees, torn ligaments in an ankle, shoulder strain, and rotator cuff issues from a injury), I use the following strains as a whole:

Skywalker OG
Wedding Cake
Fire OG
Bubba Kush
OG Kush

Another thing id recommend, is to look into user reviews of strains from multiple sources and trial/error from use.