If the page is just a generic one, which anyone can view (rather than, say, one that's been generated by the site to provide a quote in response to your personal input) then, as Davebro suggests, the simplest thing to do is just to email a link to your son.
I'll assume that you're using a PC. (If you're using a mobile phone, let us know, so that we can modify the instructions accordingly):
When viewing the page you want to tell your son about, RIGHT-click in the address bar up at the top of it. (That should highlight the whole of address. If it doesn't, quickly left-click a few times until the whole line is highlighted and then right-click ). Select 'Copy' from the menu that appears.
Then create a new email to your son. In the text field where you write your message, right-click and select 'Paste'. (In a few web-based email services that might not work. If so, ensure that your cursor is where you want the link to appear and press Ctrl and V together instead). When your son receives your email, all he'll need to do is to click on the link. That will open the relevant page in his web browser.