I require your help, naruto Fans.

Is there any reliable information regarding Zetsu's past? Family, Teammates, Place-of-Birth..Something that explains why his Exterior is so abnormal, something that explains what helped him to become who he is today. His Story.
Any piece of (true) information will be deeply appreciated. If anda do happen to know the answer (or at least some parts of it), please link me to your information-source if it's taken from a Website. Thank you.