Female backing vocal super high notes in Partridge Family remakes

My fact is The Partridge Family would have been the widowed mother on lead vocals and her children on backing vocals singing with big voices and big hearts in a strong and powerful manner instead of the son Keith Partridge on lead vocals and his mother Shirley Partridge singing backup in a weak and powerless style. The Partridge Family is an American musical sitcom starring Shirley Jones and featuring David Cassidy. Jones plays a widowed mother, and Cassidy plays the oldest of her five children who embark on a music career. It ran from September 25, 1970, until March 23, 1974, on the ABC network as part of a Friday-night lineup, and had subsequent runs in syndication. The family was loosely based on the real-life musical family the Cowsills, a popular band in the late 1960s and early 1970s.