So only Mahārāja Parīkṣit was in the womb of his mother, and that was also attempted to be killed by brahmāstra. Brahmāstra is almost similar to the atomic weapon. And the brahmāstra, the specific function of brahmāstra is that when this weapon is released, it will kill the particular men wherever he is; it will go there and kill him. It doesn't matter whether he is in front or in somewhere. The weapon is so powerful that simply by mantra, you release it, and it will kill your enemy, wherever he is. So one brahmāstra was released to kill this child, baby within the womb, embryo, to kill. And at that time Uttarā felt that her pregnancy is going to be, what is called, discharged. So immediately she approached Kṛṣṇa, that "I am feeling like that, miscarrying. Please save me." So at that time Kṛṣṇa entered the womb of Uttarā and saved the child from the brahmāstra. So Mahārāja Parīkṣit is such a devotee that he was protected from the embryo by Kṛṣṇa. Therefore Śukadeva Gosvāmī addressed, mahā-paurika(?): "You are great personality." So this Mahārāja Parīkṣit was again cursed by a brāhmaṇa. He could retaliate that, but he did not do so, just to offer respect to the brāhmaṇas. He considered himself offender. That is last stage. And because he was cursed by a brāhmaṇa at the last stage of his life, seven days, he heard Śrīmad-Bhāgavatam from Śukadeva Gosvāmī. Therefore we have got this book. This is the story.
So here Mahārāja Parīkṣit, son of Uttarā, but he married his maternal uncle's daughter. That was permissible. Still it is permissible. This kind of marriage is considered very aristocratic, to marry the daughter of maternal uncle. So Arjuna also married the daughter of maternal uncle. Kuntī is the sister of Vasudeva, Kṛṣṇa's father, and Subhadrā is the daughter of Vasudeva. So he also married. Except in Southern India, this process is now no longer existing. In Bengal and other provinces of India, they do not marry the first cousin. So that is the marriage system. But in southern India, still, to marry the daughter of maternal uncle is considered as very aristocratic. So this system was current five thousand years ago also. So Mahārāja Parīkṣit married his uncle's daughter, uttarasya tanayām. Tanayā means daughter. Uttarasya tanayām upayema. And her name was Irāvatī, Irāvatī.
So in that, in the womb of Irāvatī, Mahārāja Parīkṣit begotten four sons. The first one's name is Janamejaya. Ādi. Ādi means "beginning with." He begotten four sons, beginning with Janamejaya. The history of Janamejaya is also very nice. (aside:) You can read the Janamejaya paragraph.
Pradyumna: "Janamejaya: One of the rājarṣi kings and the famous son of Mahārāja Parīkṣit. His mother's name is Irāvatī, or according to some, Mādravatī. Mahārāja Janamejaya begot two sons of the names Jñātānīka and Śaṅkukarṇa. He celebrated several sacrifices in the Kurukṣetra pilgrimage. And he had three younger brothers, named Śrutasena, Ugrasena, and Bhīmasena II. He invaded Takṣalā, or Ajanta, and he decided to avenge the unlawful curse upon his great father, Mahārāja Parīkṣit."
Prabhupāda: Yes. Mahārāja Parīkṣit was cursed by a brāhmaṇa boy, not even twelve years old. When he heard that his father was insulted... One muni, he was in meditation, and Mahārāja Parīkṣit was in the forest, hunting. So he was very much thirsty. So in those days in the forest there were many hermitage. Saintly persons, sages used to live. So he entered one of them and asked for water. But the muni was great meditation. He could not hear him, receive the king. So he felt insulted, that "I asked water. This man is silent." So there was a dead snake; so out of anger he took the dead snakes and round, round wrapped him and went away.