Money Heist: 10 Most Insane Fan Theories
3. Rafael Is Actually The Professor's Son
Another one right out of Wacky Land. Rafael became a big part of the story in season 5, teaming up with his stepmother/girlfriend Tatiana to steal the real gold bars from right underneath everyone’s noses. While the Professor was ultimately able to get through this roadblock using his trademark cunning and a whole lot of fake gold, one fan theory that continues to persist is regarding the relationship between him and his nephew.
Breaking down their personalities would reveal more similarities between the Professor and Rafael, than between the latter and Berlin. While yes, personas are not exactly genetic, it is still plausible that the socially awkward Rafael is in fact the child of the similarly mannered Professor, instead of the more debonair Berlin.
This would put a slightly ironic twist on the ending, with clinically cautious Professor almost getting outdone by his own nephew who didn't even want to be in this line of work.