The articles mentioned before seem interesting, but don’t constitute proof. At this point it is hearsay in some sensationalist local rag. There’s always some far away family member in someone’s vicinity looking for 5 minutes in the limelight.
As far as the papacy, I recently heard there are at least 2 instances in the last 100 years where people say the current pope is not legitimate. Pope John XXIII and Pope Francis both had active opposition in the Church to their legitimacy, believing the current seat to be vacant. Coming from JW it may seem surprising, but that is actually tolerated in the Catholic Church, one had to do with the fact Pope John XXIII covered up serious corruption surrounding the Vatican Bank, for Francis they believe someone or something forced the previous pope to step down (whereas typically they must pass away before vacating the seat).