The accused identified as Montu, threw acid on Devidayal (50), his son Gopal (25) and daughter Pushpanjali (22), last evening, SSP Akhilesh Kumar Meena said.
Gopal had an argument with one Sanju, the owner of a burger joint over the quality of the burger. He was later joined by his father and sister and the argument heated up.
Meanwhile, Sanju's brother-in-law Montu, came with two bottles of acid and threw it on the trio.
The victims were rushed to the hospital, Meena said adding that Montu has been arrested and efforts are on to nab Sanju who is absconding since the incident.