because technically she is kined to Naruto because Mito Uzumaki is Tsunade's grandmother
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She has called Tsunade: Tsunade-sama (Lady Tsunade), Hokage-sama, Godaime Hokage-sama (5th Hokage), and Shishou. (master)
naruto doesnt ever become the 6th hokage because an akasuki member call pain destroyed the village and the 5th hokage tride to save every body and ran out of chakra then went into a coma so some guy called danzou was elected hokage so naruto will be either the 7th or 8th hokage
he's narutos dad alright but also when naruto fights pain the nine tails is unleashed and the 4th hokage reseals the seal when hes knocked out and sez im your father and it was me that gave you the name naruto. and another time is when jiraya was in the ninja war and he was with the 4th hokage and narutos mum and then jiraya said some thing like "what will you call your baby" then the 4th said i will call him naruto
Naruto Shippuden Episode 34
Because he honestly feels that way towards Naruto for a numerous amount of reasons.