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They can probably handle Big Blue. It is steep(er) but the trail is incredibly wide and always groomed as far as I know. It would be a blue trail at most mountains. Beer's Bluff I'd stay off of...but it's never open anyways. Upper and Lower Chutes you might want to recon yourself first as they often don't see any snowmaking so can be a bit rougher (if open).
Don't go on the weekends.
I've worked as an instructor at Blue Hills for a while now. Big Blue is a little intimidating for some, but they're opening the main side trail soon, should be this weekend. That's a pretty fun trail, worth it to wait until that's open though. Don't do weekends, way too crowded.
IMO if you live north/west of canton - head to nashoba - more terrain for the young man.
Your son should do fine. Blue Hills is the epitomy of "ski bump".
Think McIntyre in Manchvegas, granite gorge, etc.