Board Thread:Theories and Speculation/@comment-5012682-20150620162706/@comment-756329-20150620212540

Chakra nature isn't genetic, remember you are born with an affinity to one of the five so in a Nara and Akimichi's case they just learn to use Yin and Yang when they learn their families Hiden jutsu regardless of their natural affinity. Also, being Wind natured is apparently a rarity but that doesn't stop you from learning it.

What has been confirmed though is your affinity is somewhat genetic on a clan level at least. Uchiha and Sarutobi are "highly likely" and specialize in Fire nature but that didn't stop Asuma from being born with an affinity towards Wind despite being a Sarutobi.

Sasuke was born a typical Uchiha and got Fire, but under Kakashi's tutelage learned Lightning and that became his most used element. It's all in who teaches you, Boruto either is born lightning natured or Sasuke just taught him like Kakashi taught him.

So in Boruto and Himawari's case, Naruto having all elements and Hinata (theoretically) having them all as well thanks to Hamura chakra means nothing to them. They'll have whatever nature God wants them to have and they'll learn more depending on their teachers' methods