Ok - I have had increasing back issues over the years and finally got it diagnosed so let me pass on my experience and what I have learned. I have what is called spondylolysis - google it. About 10% of people have it. Some is injury some just genetics or both. It is degenerative and can make old age miserable.
Your Bro has a pinched nerve from a bulging or displaced disk. Stretching hamstrings really helps as does a few yoga moves. However, it is super important to find out if it is spondylolysis which you will need a cat scan for. So for all that have back issues I encourage you to find this out as you will end up disabled if you keep some lifting that stresses the back.
Working in oilfield country, they now per-screen labor for this as they know if someone has it and they put them in the field, they will end up paying long term dissability.
So ... Cliff notes.
- go get scanned for spondylolysis
- if have, stop lifting or you are accelerating future spinal fusion