He keeps asking to go back to places with trail centre like surfaces/blues
We started at the trail centres about 3 weeks after he got his 20″ moving from a BSO “Fireman Sam with Stabilisers”… within a couple of trips we were on reds.
9mo later we were moving to a 24″
If you want to ride trails then a decent Geo will go a long way over the all purpose Isla/Frog offerings…
If I knew what I do now and that this was going to become his main hobby (which you don’t until too late) I’d go for a Orbea MX 20… great geo, disc mounts even if you buy a rim version… cassette not free hub…
https://www.orbea.com/gb-en/fietsen/2016/mx-20-team
I have a 20” Evans Pinnacle Ash sat in the shed not used I’d sell for a reasonable offer… should you decide not to take my advice though 😀 (To be fair the other way is buy anything half decent used… if the bike then is obviously what’s holding them back in 3-4 months then sell it for more or less what you paid and then get something more serious/expensive)