Harvinder is the younger brother of Paramjeet Singh Sarna, who is president of the Delhi Sikh Gurdwara Management Committee (DSGMC).
"They both had separate businesses and Hardeep had a distillery plant and paper mill in Hargobindpur in Punjab," Harvinder Singh told IANS.
Paramjeet Singh Sarna also supported the version of his younger brother.
"There was no property dispute between them," he said.
When asked about the feud, he said: "I have no idea."
The warring brothers were killed on Saturday in a gun-battle which, police said, was the result of property dispute between them.