Respect,” starring Jennifer Hudson as Aretha and opening Friday.“Aretha channeled hardship into her singing,” he told The Post.The singing and the hardship both started young.Aretha’s mother abandoned the family — which had moved from Memphis to Detroit after the patriarch, pastor C.L. Franklin, fathered a child with a 12-year-old girl in his church congregation — when the future singing legend was just 6 years old.She juggled school and traveling on the gospel circuit with her preacher father.