There is a difference between someone refusing to learn when others are attempting to teach and your friend willing to learn but the group can't be bothered.
its a kid wots rong with u its mmo game all can play it
as on the op i have few friends in game who just take time to lern runed with them ops and li countles times it taken ages to lern for them but at some point we all will get there the problem is over expiranced players just face rolling most fp . haw many times i was in a low lvl fp or high lvl with new guys asking abouth tack all he was told to follow others then when wipe happened they blame him
As for Dad and Son as others have suggested only allow him to play if he starts learning how to play properly. Each time he refuses or back slides on bad habits cut him off for awhile. If he really wants to play he will learn. He's old enough that age isn't an excuse.