Who did Abhimanyu kill in Mahabharat

If Mahabharata happened after Ramayana, where were the descendants of Rama during Mahabharata?

The descendant of Rama at the time of Mahabharata was Brihadbala, as described in this chapter of Srimad Bhagavatam:

The son of Rāmacandra was Kuśa, the son of Kuśa was Atithi, the son of Atithi was Niṣadha, and the son of Niṣadha was Nabha. The son of Nabha was Puṇḍarīka, and from Puṇḍarīka came a son named Kṣemadhanvā. The son of Kṣemadhanvā was Devānīka, Devānīka's son was Anīha, Anīha's son was Pāriyātra, and Pāriyātra was Balasthala. The son of Balasthala was Vajranābha, who is said to have been born from the splendor of the sun god. Vajranābha's son was Sagaṇa and his son was Vidhṛti. The son of Vidhṛti was Hiraṇyanābha, who became a disciple of Jaimini and became a great ācārya of mystical yoga. From Hiraṇyanābha the great saint Yājñavalkya learned the exalted system of mystical yoga known as ādhyātma yoga, which can untangle the knots of material attachment in the heart. The son of Hiraṇyanābha was Puṣpa and the son of Puṣpa was Dhruvasandhi. The son of Dhruvasandhi was Sudarśana, whose son was Agnivarṇa. Agnivarṇa's son was named Śīghra and his son was Maru. Maru has achieved perfection in the power of mystical yoga and still lives in a place known as Kalāpa-grāma. At the end of Kali-yuga, he will revive the lost Sūrya dynasty by fathering a son. A son named Prasuśruta was born from Maru, Sandhi came from Prasuśruta, Amarṣaṇa from Sandhi, and a son named Mahasvān from Amarṣaṇa. From Mahasvān, Viśvabāhu was born. From Viśvabāhu came a son named Prasenajit, from Prasenajit came Takṣaka, and from Takṣaka came Bṛhadbala, who was killed in a fight of your father.

When Shuka says "your father" he is referring to Parikshit, so he is referring to Abhimanyu. And indeed, Abhimanyu killed Brihadbala in the Chakravyuha immediately before him, as described in this chapter of the Drona Parvati of the Mahabharata:

Then Drona, Kripa and Karna and Drona's son and surrounded the king of the Kosalas and Kritavarman these six car warriors the son of Subhadra. After surrounding this kid with all these great car warriors - too many for him, despite fighting to the utmost of his might - he robbed him of his car. After being robbed of his car, Dussasana's son, despite having a hair-raising escape himself, as luck would have it, succeeded in bringing Abhimanyu to find his end. As for Abhimanyu, he killed many thousands of men, horses and elephants, and eight thousand cars and another nine hundred elephants, two thousand princes and a great number of heroic warriors unknown to fame, and Vrihadvala sent to this battle king, also to heaven , eventually met his own death by bad luck.

Sysinite

I wonder how it comes about that the descendant of the 24th Treta Yuga can still exist on the 28th Dwapara. Shouldn't they have completely destroyed themselves in the 24th Kali?

Keshav Srinivasan ♦

@sysinit No, the sun and lunar dynasties persist for the entire Vaivasvata Manvantara. For example, Shantanu's brother Devapi and Rama's descendant Maru will be the new king of the lunar dynasty and the king of the solar dynasty, respectively, in the next Satya Yuga.

Sysinite

The number of offspring between the 24th Treta Yuga and the 28th Kali Yuga is still too low. In between there are 4 Satya, 4 Treta 4 Dwaparas.

Keshav Srinivasan ♦

@sysinit some of them were extremely durable.

Sysinite

Many Thanks . But people live only in Satya and Treta Yugas for a very long time. But in Dwapara they live a few hundred years. Dwapara lasts for a long 864,000 years. There are 4 dwaparas between the 24th and 28th Mahayuga. I think the list is highly unlikely to be complete