Nanda Baba

Nanda Baba
Nanda and Yashoda pushing baby Krishna on a swing

Nand (also known as Nanda Gopa or Nanda Baba), according to the Harivamsha and the Puranas, was the head of the Gopas, a tribe of cowherds referred as Holy Gwals. He is popularly known as the foster-father of Krishna.
Nanda was the Chief or Mandaladhish of Gokul Mandal that was one of the most powerful branches of Yadavas.Vasudeva, took his new-born son Krishna to Nanda on the night of the child's birth so that Nanda could raise him. Nanda, who was married to Yasoda, brought up both Krishna and Balarama. Krishna derives his name Nandanandana (meaning son of Nanda) from him.
Nanda was brother (cousin) of King Vasudeva.

Nandagopa was the father of Goddess Durga(Yogamaya) and adopted father of Lord Sri Krishna. He took care of his sister Rohini's son Balrama. Nanda, also identified as King Nanda in many scriptures was a kinsman and great friend of King Vasudeva.

According to Bhagavata Purana, King Nanda of Gokul Kingdom was stepbrother of King Vasudeva.

King Vasudeva married Devaki, the niece of King Ugrasena of Mathura. Devaki's cousin, an evil tyrant named Kamsa, had imprisoned Ugrasena and usurped the throne. Owing to the divine prediction that Kamsa would be slain by the eighth child of devaki, Kamsa arranged that all of Devaki's sons should die at birth. Six children thus perished. But the seventh child was magically transferred in to the womb of Rohini,Vasudeva's another wife living under care of King Nanda, and the child so born was Balrama, Krishna's elder brother. Krishna himself was placed by Vasudeva into the hands of Nanda. Both Krishna and Balrama were brought up by Nanda, the cowherd chief and his wife Yashoda.