Last week, rumours began circulating that Sinanaj is three months pregnant with Humphries's child, following their brief relationship in the wake of his split from ex-wife Kim Kardashian.
Humphries is allegedly seeking a paternity test before acknowledging the child, but TMZ reports that the basketball player's family is hoping the test shows he is not the father.
Sources told the website that Humphries's family is disappointed to have found out about the situation through the media, despite the 27-year-old finding out weeks ago.
Following news reports, Humphries is said to have spoken "vaguely" about Sinanaj's claims, but has given no details of the incident.
It has been reported that Sinanaj has dropped legal action against Humphries in the hopes of a reconciliation with the NBA star.
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