Lyricist Santosh Anand, popular for writing songs for films like "Shor" and "Kranti", feels helpless and laments the slow pace of probe into his son's suicide in October.
Santosh Anand was here to receive a lifetime achievement award by NGO Aradhana.
Talking to media Saturday evening, he said his son "was not a coward, but intelligent and bright".
"Unfortunately, he did not share his frustration and sorrows with me," he added.
Santosh Anand has now demanded a CBI inquiry to get to the truth of the case.
Santosh Anand's son Sankalp and his wife, who had reached a railway track in a car, had flung themselves before a train before people in Kosi area could prevent them.
Police said Sankalp worked in a government department. He and his wife lived in Rohini in Delhi. A suicide note was recovered from the abandoned car.