At one time eBay allowed users to share a wish list publicly, but eBay eventually did away with the feature and now the Wish List is just another private list like the Watch List.
Your son may be able to share individual items via social media, or paste item links into an email message.
There are also third party sites that allow users to create shareable wish lists with links to various sites or items.
https://en.softonic.com/top/wishlist-apps
