I think you’re on the right track. If he wants a handgun he should get a handgun.

Let him shoot as many of yours as he wants to and then let him decide. Sounds like he’s done alright in life so far doing that.

Honestly, if you’re an experienced shooter he would probably be better off learning safety and the basics from you rather than a local instructor, depending on your comfort level doing it and your brother/brother dynamic.

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“What you got, ain’t new.”