The former brother-in-law of former MLB star and current baseball analyst Alex Rodriguez is demanding millions of dollars in back pay from the ex-slugger in a civil suit filed to Miami civil court last week. The suit alleges that a business of A-Rod’s tried to profit off of the damage that Hurricane Ike created in 2008 and that the three-time MVP nearly caused the ex-brother-in-law to lose his home.

Constantine Scurtis—the brother of Cynthia Scurtis, Rodriguez’s wife from 2002 to 2008—claims that a business relationship between himself and the former Rangers player began to deteriorate as the ballplayer’s marriage did. They formed a real estate partnership in 2003 where Rodriguez would make most of the money, as his name was the “cash cow” of the business, and Scurtis would get the rest plus a fee for any acquisitions made.

Then in 2008, Scurtis was allegedly kicked out of his office and, despite reassurances from Rodriguez himself, the business relationship and friendship was dissolved. This became official when, as the lawsuit claims, Rodriguez sold the company’s assets to a new company, this one without Scurtis.

Alex Rodriguez is fuming over losing the Mets to billionaire Steve Cohen and griping that the process was rigged, multiple sources tell The Post.

Sources close to the former Yankees slugger say they lost the Queens team on Friday, Aug. 28, after the Mets’ banker — Steve Greenberg of Allen & Co. — reached out to ask for a sneak peek at what was being offered. The request came days ahead of the official Aug. 31 bidding deadline.

A-Rod — who has been vying for The Amazins with his superstar fiancee, Jennifer Lopez — reluctantly complied with the request only to learn later that same day that the Mets were in exclusive deal talks with Cohen.

The founder of Point72 Asset Management had offered $2.35 billion for the team — or just $50 million more than the $2.3 billion bid offered by Rodriguez and his group of investors.

The former Yankees third baseman is now convinced that the Mets spoon-fed his bid information to Cohen so the billionaire financier and art collector could have the highest offer and win the team. “They took the bids and showed them to Cohen,” a source familiar with A-Rod’s thinking claimed.