Devraj jumped before a train along with his son Himanshu (7) this morning near Rohi railway crossing which falls under Kokhraj police station area, they said.
Devraj, who got remarried eight months ago, used to have serious tiffs with his second wife over his two sons from the previous marriage, a police official said.
His first wife had passed away a few years ago.
Last night again Devraj and his wife had a fight over the issue which apparently prompted him to take the extreme step, the official said.
The bodies have been sent for post mortem, the official added.