Amiram Ben-Uliel, 25, was sentenced by the court in the town of Lod following his conviction in May for the 2015 killings.
He was also found guilty of two counts each of attempted murder and arson, along with conspiracy to commit a hate crime.
Ben-Uliel threw a firebomb through a window of the Dawabsha family home while they slept in the village of Duma on the occupied West Bank.
Ahmed Dawabsha, who was four at the time, was severely burned in the attack which killed his 18-month-old brother Ali, his mother Riham and father Saed.
The murders shone a spotlight on Jewish extremism and sparked accusations that Israel had not done enough to prevent such violence.
The court said the murders were “carefully planned and driven by an extremist ideology and racism”.
Ben-Uliel wanted to kill the family “solely because they were Arabs living in Duma, deciding that their death would avenge that of Malachi Rosenfeld”, the court said in a statement.
Rosenfeld was an Israeli shot dead a month earlier by a Palestinian near the West Bank settlement of Shilo…
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