Zion Williamson and family allegedly failed to repay $1.8 million loan.
Ankr PBC filed a civil lawsuit in U.S. District Court.
The California-based technology company provided the loan in 2021.
The loan aimed to establish a marketing relationship with Williamson.
Stepfather Lee Anderson represented Williamson in business dealings.
Anderson required upfront payment to negotiate business relationships.
Ankr believed Anderson had authority to negotiate for Williamson.
Williamson's mother, Sharonda Sampson, is also named as a defendant.
The loan was allegedly needed for expensive investments and obligations.