Lord Siva made Murugan to sit on His lap and asked him the meaning of 'OM'. Murugan whispered the meaning to Lord Siva's ear. Thus he became Swami Nathan, the lord of his own father.
Visnu's daughters Amirta Valli and Sundara Valli both wanted to marry Lord Murugan and were praying to him at Saravana Poikai.
Murugan appeared before them and arranged for Amirta Valli to be born as the daughter of Lord Indra and for Sundara Valli to become the daughter of sage Siva Muni and to be adopted by a hunter chieftain as his step daughter.