Milton Rothstein, father of television composer Rick Rhodes and singer Robyn Rothstein, died Sunday from complications of Alzheimer’s disease in Los Angeles. He was 75.In addition to his son and daughter, he is survived by his wife of 53 years, Shirley Rothstein, and two grandchildren. Services will be held 12 p.m. today at Mt. Sinai Memorial. The family requests that donations be made to the City of Hope-Duo Club, c/o Shirley Rothstein, 14347 Albers St. #306-B, Sherman Oaks, CA 91401.