Ramayana
सङ्गृह्य तं तु दौहित्रं प्रविष्टः सागरं तदा । आर्यकः स हि तस्यासीत्पुलोमा येन सा शची ॥ 7-28-20 ॥
Taking his daughter's son, he then entered into the ocean; for that Puloman was his maternal grandfather, he by whom Shachi had been begotten.
english translation