Naruto Shippuden Episode 34

[Abdula]

But I guess that's exactly what a tool isn't it? A person willing to give up their own desires and aspirations in order to server the desires of the person who was there for them at a miserable time in their life and took care of them.

No, a tool is someone who has no other desires or aspirations other than to serve someone else. Big difference.

Shizune is Dan's (Tsunade's BF) niece. Dan's sister (probably Shizune's mother) died in the war (and he was possibly taking care of her after this). When Dan later died and Tsunade left the village she took Shizune with her as her apprentice, they traveled together until Tsunade came back to the villiage to become Hokage.

As far as I know this was only mentioned in the english dub so I don't consider to be a part of the official canon, although it is a sufficient explanation.

[Yukimura]

As far as I know this was only mentioned in the english dub so I don't consider to be a part of the official canon, although it is a sufficient explanation.

You should take a look at:
Naruto Anime - Episode 90 [ANBU-AonE sub] 3 min and 26 seconds in or
Naruto Manga - Volume 18 Chapter 154 Page 5 Panel 4

Though if you don't want to waste the time you can just trust that I have done this and am not making up my facts out of thin air.

@Kraco my comment wasn't directed at you. I neglected to add in an @Abdula but it was directed at him since I felt he was either ignoring or ignorant of the Shizune-Dan-Tsunade relationship.