Maybe Voldemort Isn’t the Only Descendant of Slytherin – Dumbledore Is Too!Obversa Author
Obversa has a well thought out article that goes in deep to explain his idea.
My theory is that Dumbledore didn’t “learn” to understand Parseltongue…but that he can understand it, because he, like Tom Riddle / Lord Voldemort, is a distant descendant of Salazar Slytherin. He inherited (part of) the Parseltongue gene.
Rosalita Moog (curated content)