Kuldeep, who was reportedly miffed over delay in his marriage, returned home at around 4:30 am. A heated dispute arose when his mother Kamlesh (54) questioned him why he was late, and in a fit of rage, he "shot her in the chest with her father's double rifle", a police official said.
As the woman collapsed in a pool of blood, Kuldeep tried to escape but was chased and nabbed by his brother with the help of a constable, who was on night patrol.
The gun belonged to Kuldeep's father, who worked as a guard in a finance firm.
Police have registered a case of murder and arms act and have arrested Kuldeep.
During questioning, he revealed that he was holding a grudge against his family as he held them responsible for delay in his marriage, police said.