Manny Pacquiao -- Aunt Claims Fight Was Fixed (VIDEO)

The Mayweather vs. Pacquiao fight was unanimous in everyone's eyes, but Manny's aunt and cousins are steadfast ... the fight was fixed.

Aunt Lilia and crew were leaving the Mandalay Bay on Sunday when our photog asked whether Manny was cheated, remember the boxer felt he had won the fight. His family went 5 steps further and claimed the whole thing was rigged and people got paid off.

They weren't done... they also trash talked Floyd.

TMZ Sports got Aunt Lilia back in March when she belted out the signature tune from 'Frozen." She might want to take some advice ... let it go.