The father of former boxing champion Ricky Hatton was arrested for attacking his son the day before he announced his comeback, police sources said.
It is understood that Hatton, 33, had to protect himself after his dad Ray, 61, attacked him during a heated row in the car park outside his Manchester gym.
Police were called and Hatton senior was arrested and cautioned.
A spokesman for Greater Manchester Police said: "Shortly before 11.45am on Thursday, police received reports that there had been a fight involving two men outside a health and fitness club on Market Street, Hyde."
More top news
The odd light shower may appear across Scotland and Northern Ireland but for most of the UK it will be fine and dry.
Four men have been jailed for a plot to exchange guns by hiding them in a wheelie bin.
Jeremy Corbyn has urged young people across Britain to "step up", register to vote, and "claim your future" ahead of the upcoming election.