I think your son has caringbridge, like Justin. The carepages work a little different, they take you to a home page to sign in.(and there should be a link to any page you ever checked unless you delete them) I think you've probably checked someone carepage before because a few of the kids here have used them, so before you set up a new account, try signing in with your email addy and if there is a password you usually use. or sign in with your addy and do the forgot password option and you probably have an account.
Then you can either follow a link someone posts, and when you sign in it should take you to that page or you can go to carepages.com sign in and scroll thru your list.