Board Thread:Naruto Discussions/@comment-26508646-20150705183625/@comment-5936871-20150706030828

@Bambusek Hagoromo stated that each of his sons inherited half of his chakra genetically, so you receive chakra from both parents lol. Anyway, Boruto and Himawari could have been born with some of Kurama's chakra simply because once you become a Jinchuriki that beast's chakra becomes apart of your body. This is proven as even after Shukaku was extracted and Gaara died, and was then revived, he later still had Shukaku's chakra as he was able to latch onto it with his sand. So if some of the chakra still remains in your body, it can possibly be passed on, especially if you have massive amounts of it like Naruto does.