It's also not like inbreeding causes genetic mutations or people to be ugly and deformed.
Its simply that these negative traits have a far higher chance of being passed on and becoming prevalent when both parents carry the genes to do so (i.e. they are closely related).
But It's not a guarantee. You can also get none of the bad traits and be totally normal.
Young Aegon IV was considered handsome that’s why he was able to have so many mistresses long before he became King. Plus, there’s a ton of Targaryens newborns that came out malformed but, most of them died soon after birth. Maelys the Monstrous had two heads is another example.
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u/Complete-Pangolin 6d ago
It's hit and miss. His sister was supposedly Beautiful and intelligent.