The mishap occurred when 35 to 40 people were returning in a tractor trolley from a mass marriage ceremony of Bairwa community in Piplada village, they said.
The deceased have been identified as Shravan Lal Bairwa of Shopur village and 2-year-old Prince from Bishanpur village, SHO of Etawa police station, Madan Lal Khateek said.
He said at least 15 people were injured in the incident, including nine women and four children.
The brother of the deceased bridegroom was driving the vehicle at the time of the mishap, he said, adding a case has been lodged against him and further investigation is underway.