netarā yat-suto dhruvaḥ

jaye-of the two wives; uttanapadasya-of King Uttanapada; sunitih-Suniti; surucih-Suruci; tayoh-of both of them; surucih-Suruci; preyasi-very dear; patyuh-of the husband; na itara-not the other; yat-whose; sutah-son; dhruvah-Dhruva.