Pandu was restrained from sexual life because of having been cursed by a sage, and therefore his three sons Yudhisthira, Bhima and Arjuna were begotten through the womb of his wife, Kunti, by Dharmaraja, by the demigod controlling the wind, and by the demigod controlling the rain. Pandus second wife, Madri, gave birth to Nakula and Sahadeva, who were begotten by the two Asvini-kumaras. The five brothers, headed by Yudhisthira, begot five sons through the womb of Draupadi. These five sons were your uncles.