I mean make him read Hallaig by Somhairle MacGill-eain.
And, ideally, go and visit a cleared township.
https://maps.app.goo.gl/nc8uhBogrBCjgjYs9
I used to walk out there most weekends when I was at school. Until about 175 years ago, those were homes. Families lived there.
The white dots you see are sheep, which is of course why families don't live there now.
Good Gaelic, incidentally, where did you speak it?