The family of a cabbie turned real estate billionaire is fighting a big bucks bid from a relative who wants a $102 million chunk of his estate.

The son-in-law of Tamir Sapir, who died in 2014 and was once worth $2 billion at the height of the real estate boom, has no right to the hefty payout, Sapir’s son Alex said in Manhattan Surrogate Court papers.

The son-in-law, Rotem Rosen, is in the midst of divorcing Tamir Sapir’s daughter, Zina, but says he’s owed the cash for work he did on the sale of Sapir Organization properties, including its biggest asset: 11 Madison Ave, which went for $2.6 billion in 2015.

Once CEO of the Sapir Organization, Rosen claims in court documents he was cut out after a “falling out” with Alex Sapir in 2017.

Reps for Tamir Sapir’s adult children slammed Rosen’s claim as a “sham” in court papers and said he’d already been paid for the work he did.

Sapir’s estate had sunk to a measly $600 million by the time he died, according to court records. He was once slammed with $150,000 in fines when the feds discovered a gross collection of elephant tusks, animal hides and barstools upholstered in python and anaconda skins about his Florida yacht.