The victim, Om Prakash, was beaten to death on February 18. His sons Rajesh and Neeraj were arrested last night in Indirapuram area here.
The brothers told the police that they were unhappy with Om Prakash for having an extra-marital affair and an extravagant lifestyle. They said their mother was also upset with Om Prakash's habits.
Police have also arrested Rajesh's brother-in-law Sunil in connection with the murder.
"Rajesh and Neeraj told police that Om Prakash had an extra marital affair and used to live a lavish life. He recently sold a plot for Rs 80 lakh, but he didn't give them a single penny which angered them," said a senior police official.
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"To kill their father, they hired a contract killer, Devendra, for Rs nine lakh and also involved Sunil in the plan. On February 18, when Om Prakash was going to Mainpuri district after collecting rent, Devendra, along with his two accomplices, brutally attacked him with iron rods and fled from the spot," he said.
After the death of Om Prakash, Rajesh had registered an FIR at Indirapuram Police station to mislead the police officials, the official said.
"Police arrested Neeraj, Rajesh and Sunil last night and recovered four mobile phones from their possession. A manhunt has also been launched to nab their three other accomplices," he added.