Board Thread:Theories and Speculation/@comment-5413572-20150114180437/@comment-26302001-20150118020045

Every child is basically little half clones of each parent, in the majority of aspects, dna wise. So they did indeed get some things from their father who if we use logic was also an Otsutsuki with Byakugan so maybe it was in his genes that was passed to Hamura which is why Kaguya does not possess it.