Nobody Is Above Krishna - Prabhupada 0692
731113 - Lecture SB 01.02.07 - Delhi
How Vasudeva can become His father so that His name is famous as Vāsudeva, "Son of Vasudeva"? The thing is that Vasudeva formerly underwent severe austerities, and he wanted a son like Kṛṣṇa. So Kṛṣṇa agreed that, "Like Me, there is nobody else." Kṛṣṇa is asamordhva. Nobody is equal to Him; nobody is above Him. Therefore Vasudeva, in his previous birth, he wanted like . . . a son like Kṛṣṇa. So He could not find anyone like Him. Therefore He agreed Himself to become his son.
The idea is that Kṛṣṇa, the Supreme Personality of Godhead, when He comes upon this material world just like ordinary human child, He accepts His devotee as His father, His devotee as His mother. That is the way. Therefore Kṛṣṇa appeared as the son of Vasudeva, and He is well known as Vāsudeva.