I've been playing guitar for 5 years, I've been in a couple bands and I've taken a few music and guitar classes.
He's a chill dude and even though he doesn't have official credentials he knows what's up and can definitely help someone who hasnt been playing for that long extend their knowledge and give their playing a different feel. Or idk that happened to me!
I use songs and written notes and my own guitar as examples.
There is a band within the family, they're all brothers (my uncles and dad), they are devotes to music. They don't do anything else, as a matter of fact. I'm greatly influenced by them and my grandad (who knowa music theory). I've also taken guitar classes and I've had experience for 5 years of non-stop playing.
It's cheap. Hahahaha.
We talk about what my students know first.
Very young students. Kids (7-10 yrs old), teenagers (around 13/14 yrs old), and people my age (around 20).
A bunch of local shows my boy.
Connect with them and have fun in the process. Be patient, devoted, focus ans enjoy it. Make sure they can clearly explain whatever it is they want you to understand.
What do you want to do that you feel you could use some help with. Maybe examples.