Board Thread:Theories and Speculation/@comment-29769110-20161017201027/@comment-5085906-20170903080305

Ryanuchiha01 wrote: Sarada is daughter of Karin Uzumaki & it is finally proven. So all those who are saying that she is not daughter of Karin Uzumaki are wrong. No. She's the daughter of Sakura. Karin helped deliver her. Suigetsu's an idiot.

They'll clear that up in the next episode of the anime, but if you want you can read the Gaiden manga to find out what I just told you ahead of time.