How many people here have parents that are their duals?
Do you know IRL other people that do? Did you notice any difference between the people that have, and those that don't?
What I mean to say isn't parents that are dual to each other, but just one parent being the dual of the son (although it would be even more interesting to analyze the situation in which there's both parents that are duals, and the parent being the dual of the son/daughter)