Māma duì dìdi yǒuxiē piānxīn, zǒng gěi tā gèngduō línghuāqián.
Mom is a bit biased toward my younger brother, always giving him more pocket money.
Tips
usage
偏心 in everyday speech means showing favoritism. In engineering/mechanics, it describes an off-center axis (偏心轮 = eccentric wheel). Context tells you which sense is meant.
