In the Mahabharata, Balram’s daughter Vatsala married Abhimanyu, son of Arjun and Subhadra. Subadhra was also the sister of Balram.
In the epic Mahabharata, Vichitravirya had no child with wife Ambalika. Vichitravirya step brother Ved Vyas impregnated Amablika and they were blessed with Pandu.
Pandu has two wives, Kunti and Madri. Kunti became the mother of Yudhishthira, Arjun, Bheem, Nakul, Sahdev. Madri was granted a son by each Ashvinikumar, Nakula and Sahadeva who, are known as the Pandavas.
Draupadi married the five Pandavas. She became a mother of five sons, one son each from the Pandava brothers.
Arjun married Krishna’s sister Subhadra. Whereas, Balram wanted Subhadra to marry Duryodhana.
Samba, son of Krishna and Jamvati married Duryodhana daughter’s Lakshmanaa. This is how Krishna and Duryodhana became in laws.
Yuyutsu in the Hindu epic Mahabharata was a son of Dhritarashtra with Gandhari's maid. He was the only son of Dhritarashtra who survived the Kurukshetra war.
Iravan, son of Arjun requested that he be married before his death. Krishna satisfied this boon in his female form, Mohini.