Sarfraz Khan, 35, was stabbed to death and three men were seriously hurt when a row, which began over the use of a mop and bucket, escalated.
Mohammed Nasar, 32, and Tariq Mahmood, 26, of Cecil Avenue, Great Horton, were given life sentences at Bradford Crown Court for Mr Khan's murder.
Nasar must serve at least 30 years and Mahmood 27 years.
Amjid Ali, 39, and Amir Ali, 19, also of Cecil Avenue, were cleared of murder but found guilty of manslaughter.
Amjid Ali received an 18-year jail term, Amir Ali was handed a 14-year sentence.
More on this and other local stories from across Yorkshire
During the trial, the court heard there had been bad blood between two sides of the extended family and the row relating to the cleaning equipment was "the straw that broke the camel's back".
A fifth defendant, 33-year-old Sajid Hussain, also of Cecil Avenue, was previously found not guilty of charges of murder, manslaughter, inflicting GBH with intent and unlawful wounding.
All four men received further jail terms for a string of charges, including wounding with intent and grievous bodily harm.
Four men have been jailed over the killing of their cousin in a dispute over a family-run ice cream business.