My brother is in a similar situation, though younger, and it's especially weird in our family because my dad grew a full extra tooth near the front for no appar

My brother is in a similar situation, though younger, and it's especially weird in our family because my dad grew a full extra tooth near the front for no apparent reason, and his brother regrew all four wisdom teeth after having them extracted, so you'd think my brother would err on the side of too many teeth, not too few! (We're a bit screwy in general, though. My dad has an extra vertebra, besides the extra tooth, and I managed not to get enough vertebrae, but I have 1.5 extra ribs.)