Lectures and Commentaries on Srimad Bhagavatam Canto 2, made in Vrindavan (India)
The purpose of Śrīmad Bhāgavatam is to glorify the Supreme Absolute Truth, known as Śrī Kṛṣṇa, for the benefit of the suffering humanity. Śrī Vyāsa himself calls this Purāṇa the ripened fruit of the Vedic tree and compares it to the personification of rasa, or devotional relish. It is to be tasted by the rasikas, the connoisseurs of rasa, and relished by the sahṛdayas, the sober-hearted people or those whose hearts are imbued with sattva (SB 1.1.3)
Family relations independent of their relation to Krishna are only imaginary. We have no relation with anything or anyone. The only way we can relate is through Krishna. Therefore, Kunti prayed to cut her blood relation to Pandavas and Yadavas ,and have relation with them only as devotes of Krishna.