As another discussion tangentially related, Hutton Gibson (Mel Gibson's Father) Identified as "traditional Catholic" and "wrote critically of those who reject Sedevacantism" (actually I think it was sedeprivationism): https://infogalactic.com/info/Hutton_Gibson
https://infogalactic.com/info/Traditionalist_Catholic
https://infogalactic.com/info/Sedevacantism