The Petah Tikva District Court sentenced Damian Karlik Tuesday for the 2009 murders of restaurant owner Diitry Osherenko, his wife, Tatiana, their children, Revital, 3, and Netanel, 4 months, and two of the children's grandparents in the family's Rishon Letzion apartment south of Tel Aviv in central Israel, Haaretz reported.
Five of the victims had stab wounds.
The Petah Tikva District Court had convicted Karlik last month of the murders as well as conspiracy to murder, theft and arson.
On top of the life sentences, he received a 10-year sentence for breaking into the family's home, arson and other criminal charges and was ordered to pay thousands of dollars in compensation to relatives of the Osherenkos.
Karlik had confessed to the killings but later retracted his confession, Haaretz said.
Karlik became disgruntled after Osherenko fired him from the family's restaurant for stealing a bottle of vodka.
Karlik's wife, Natalya, was sentenced to 13 years in prison for her role in the murders as part of a plea deal.