Narayan Sai, the son of rape convict Asaram, has been sentenced to life imprisonment by Gujarat's Surat sessions court on Tuesday. <br />''<br />''He was convicted by the court in a rape case on April 26.   <br />''<br />''Narayan Sai was arrested in 2013 in a rape case of a Surat-based woman, who was a disciple of his father between 2002 and 2005. <br />''<br />''The rape case was filed in 2013, when the woman and her sister approached the police.<br />''<br />