[musicman1951]

I started kids when they were about 10, so I have no actual experience teaching 5/6 year olds.

Generally, at this age I suppose anything they think is fun would be a good idea. I absolutely agree that at some point they need to transition to music notation, but that may already be in the plan. It couldn't hurt to ask.

I'm having a hard time picturing the size of the boy relative to the size of the guitar, but I agree that one finger sounds strange. But if he has to cover a major 3rd on one string he's going to be moving his hand one way or the other.

An expensive ride? You're paying good money for this instruction? In that case I'd definitely want a good look at the entire year's curriculum.

Worth it is something only you can decide, but so far it doesn't sound like anything you couldn't do at home.