Sukhraj Singh Atwal, of Derby, was told it would be 20 years until he is eligible to apply for parole after a jury at at the Nottingham Crown Court found him guilty of murdering his step-grandfather Satnam Singh, the father of his mother's ex-husband.
The motive for the murder was a "long-running and acrimonious" family feud.
Atwal attacked Singh as he walked from his home, in Princes Street, Derby, to open his local Gurdwara, in the same street on July 23, 2015.
His trial, which lasted almost three weeks at Nottingham Crown Court, heard how the 74-year-old was found unconscious yards from his home which is also on Princes Street.
Singh suffered 41 fractures to his chest, lacerations to his heart and "blunt force trauma" to his body.
His injuries were so severe that it was believed that he died as a result of a hit and run.
But a Home Office pathologist later confirmed that Singh had died as a result of an attack.
"Make no mistake, this was a savage, frenzied and sustained assault that was driven home with real venom," Aspden had said.
Singh died at the Royal Derby Hospital on the day of the attack.
Sentencing Atwal, Judge Gregory Dickenson said, "You attacked Satnam Singh as he walked from his home to the local Gurdwara. It was, I am sorry to say, a brutal and merciless assault."
"There is nothing to suggest even the slightest degree of provocation on the part of Satnam Singh. You have shown no remorse," he said.
"You did nothing to raise the alarm. The minimum term you must serve before you can be eligible for parole is 20 years," he added.
The family of Singh said they were distraught to lose "such a loved and valued member of the family" but said justice had been done.
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