If you are going classical guitar I would suggest Rondo Music:

https://www.rondomusic.com/Classical_Nylon_String_Acoustics.html

I have a number of guitars from them, including a classical, and they are all very good instruments.

If going classical I also suggest getting folk guitar strings if/when a string breaks:

https://www.juststrings.com/daddarioacousticguitarfolk.html

They are like classical strings except they have a ball end, thus it is much easier to change strings.

Also do not purchase an expensive guitar. Experience has shown me that many young people want to play but do not want to practice and consequently give up. Start with something like Rondo Music and if he is really into playing then get ready to purchase him a better guitar in about a year.

One last thought purchase a guitar tuner when you purchase a guitar. Guitars must be kept in tune otherwise the neck may warp and most inexpensive guitars do not have a way to correct that. I have an inexpensive classical guitar from Rondo Music that is about 4 years old and still in perfect playing condition because I kept it in tune. Note of course that humidity and dry air can also cause problems.

Good luck

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