Clear this confusion

[Kurama2012]

Sasuke said it when Sarada was standing nearby.
The gaiden is not over yet, the things you're asking are yet to be answered, but one fact is clear: Karin is the mother, there is nothing you can do to change that. :lol I don't mind your denial, though, stay mad, stay irrate.

Okay what did suigetsu use for DNA? Huh for all we know he could have used sasukes after all this is Karin she was or still is crazy about sasuke and her having his dna isn't to far fetched
Also the way it's revealed seems a bit off

 

[senjusana]

Why couldn't Karin take care of her own daughter, if she was the mother?