Shiva Purana
कर्कट्युवाच ॥ पिता ते कुम्भकर्णश्च रावणानुज एव च ॥ रामेण मारितस्सोयं भ्रात्रा सह महाबलः ॥ १० ॥
Karkaṭī said:— Your father was Kumbhakarṇa the younger brother of Rāvaṇa. That powerful demon was killed by Rāma along with his brother.
english translation
karkaTyuvAca ॥ pitA te kumbhakarNazca rAvaNAnuja eva ca ॥ rAmeNa mAritassoyaM bhrAtrA saha mahAbalaH ॥ 10 ॥
hk transliteration by Sanscript