Hi, I confirmed your mom, using the non-Comcast address she gave. Comcast is one email-provider that I get relatively often with "please confirm manually", I'm not sure what happens with those emails.
Your dad ("samdad4") I confirmed with his Comcast address (only one provided).
Your parents need those email addresses to be "reachable" in case they forget their passwords. Then the reset link is sent to this address.