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tasya yaksa-patir devah
kuberas tv idavida-sutah
ravanah kumbhakarnas ca
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Visrava had two wives. The first wife was Idavida, from whom Kuvera, the master of all Yaksas, was born, and the next wife was named Kesini, from whom three sons were born — Ravana, Kumbhakarna and Vibhisana.