Follow the Unresponsive Profile Managers process.
Start by making a Trusted List request for one of the profiles, also indicating the other relatives you would like access to (for example, you might ask for Vincent Belt and his siblings and ancestors). Make a copy of your trusted list request message, as it will not be saved here.
If you get no response in a reasonable time, follow up with a private message and a message on the other member's profile. See the Unresponsive Profile Managers page for the next steps to take if that doesn't work.