Board Thread:Naruto Discussions/@comment-37624536-20191220132815/@comment-38964308-20191220135252

Tsunade is the grand-daughter of the First Hokage (from the Senju Clan) and Mito Uzumaki (from the Uzumaki Clan),both clans are relatives and have a very strong alliance,if not friendship,however the Uzumaki Clan never became part of the Hidden Leaf despite that in the name of this friendship,they were honored by putting their symbols in the back of the Hidden Leaf's combat suit or building the Uzumaki Clan's Mask Storage Temple in the outskirts of the village,they were established in the Land of Whirpools and were massacred by a coalition of shinobis because of the threat and the might of their Sealing Jutsus,and before or after that,Kushina Uzumaki was selected as the next host of the Nine-Tails because of her exceptionnal chakra-even for an Uzumaki-next after Mito;her distant relative. Naruto and Tsunade are not cousins,they a (VERY) distant relatives,so perhaps it was not considered something very significant have they knew or not