Amba, Ambika, and Ambalika are three sisters that Bhishma kidnaps and forces to have children with Vyasa (since he himself is celibate). Amba closes her eyes during sex, giving birth to the blind Dhritarashtra; Ambika goes pale during sex, giving birth to the pale Pandu; and Ambalika doesn’t recoil, giving birth to the wise Vidura.