Krsna's fair-complexion, white-haired and white-attired grandfather is named Parjanya Maharaja, because he is like a great cloud (parjanya) showering the nectar of auspiciousness. He is the best of all the residents of Vraja.
Desiring a worthy descendant, he followed the advice of Devarsi Narada and engaged in the worship of Lord Narayana, the husband of Laksmi. As he was worshiping Narayana at Nandisvara-pura, a pleasant voice spoke the following words from the sky.
"Because of your pious austerities you will obtain five sons. Of these sons the middle one, named Nanda, will be the best. Nanda's glorious son will delight the residents of Vraja. He will defeat all oppositions. Both the demigods and demons will worship Him, touching the jewels of their crowns to His lotus feet."
Hearing this, Parjanya Maharaja became happy and decided to reside at the place. He lived there until he saw the Kesi demon arrive and at that time he became frightened and fled with all his associates to Mahavana.
Parjanya Maharaja's brothers are named Urjanya and Rajanya and his sister is an expert dancer named Suverjana. Her husband is named Gunavira and they live in the town named Surya-kunja.
Having taken a vow of friendship in their youth, Parjanya and Sumukha (Krishna's maternal grandfather) always remain the best of friends. Nanda Maharaja and many other of the cowherds are descended from their families.(SSRKGD)