[quote name='hiram.k.hackenbacker' timestamp='1494144454' post='3293529']
That's all very well, but you just don't do that to good friends, which is how the OP has described him.
[/quote]
true, but the OP didn't say he was a good friend, just a good bloke.
I managed a band that had seven members. One was the singers brother who played a tambourine . Another friend was on keys, he could barely play the simplest chords.
The band never went far coz splitting far call between 7 members doesn't pay for strings, let alone petrol.
Now that I know he is a mate of yours, you should keep playing with him, but try to convince him to take lessons, maybe if you all announced you are all taking lessons to improve he will join in?
Never too old for lessons, our drummer is starting lessons. He is 65 !