If you go to the profile page, it lists Walters parents. You can click on either parent and see their profile. And on those profiles, you can further click on a parent name and go back further, so I'm not quite sure what you haven't been able to see.
The profile manager on these individuals has placed in numerous internet links to click on and further view records and sources and has even provided hours of operation/addresses etc for some of them which is quite helpful.
If that doesn't get you to where you want to be: on the right hand side, under the profile details there is a link that looks like this:
Profile manager: Lauren W [send private message]
You can click on [send private message] on the page and email the profile manager directly with any questions you might have.
Maybe you'll find out you are long lost cousins as well!