From Gopal Campu by Srila Jiva Goswami and and Ananda Vrindavan Campu by Kavi Karnapura
In Gopal Campu Srila Jiva Goswami describes that the father of Nanda and Upnanda was Sri Parjanya who was chief of the cowherds in the lineage of the Yadus. Sri Parjanya had five sons. When he retired from family life he installed his eldest son Sri Upnanda as heir. Upnanda accepted the title in accordance with his father’s wish but he immediately deferred the title of chief to his younger brother Sri Nanda.