The prosecution case was that Mayilsami, his wife Radhamani and son Paneerselvam had trespassed into the house of one Rajendran and hacked him to death, over a property dispute near Pollachi in the district on March 20, 2012.
Police had registered a case, which was going on in the 3rd Additional District Court.
Judge V Subramaniam found the trio guilty, sentenced them to life and also slapped a fine of Rs 5,000 on each of them.