While awarding death penalty to Selvam and Rangaraj, Additional Sessions Judge Mohammed Jiyabutheen sentenced three others - Daivasigaanai, Nagaraj and Anand to life term for their roles in the killings.
The prosecution case was that one Thangavel of Palladam and his 11-year-old daughter were burnt to death at different places on October 6, 2015.
While Thangavel's body was found near Mangalam, the girl's corpse was recovered at Vadavalli in Coimbatore.
The post-mortem examination report had indicated that the girl was assaulted sexually and burnt alive.