- Older sister of Olivia Newton-John.
- She met her third husband, actor Jeff Conaway, at an Allan Carr party during the filming of Grease (1978), which co-starred Jeff and her sister Olivia Newton-John. She was 35 and he 28 at the time. They married two years later in 1980 but divorced within a few years.
- Son Emerson Newton-John (born 1974) is a professional race car driver who has raced in Europe, Australia, and the United States.
- Diagnosed with brain cancer [April 23, 2013].
- She has grandchildren: Emerson's son and daughter, Brin and Valerie, and Tottie Goldsmith's daughter, Layla Lee-Curtis.
- After her death, she was cremated and her ashes were scattered at Cape Byron, NSW, Australia (her famed sister, Olivia later confirmed this in an interview).
- Mother, with Brian Goldsmith, of Tottie Goldsmith.
- Aunt of actress Chloe Lattanzi.
- Sister-in-law of Amazon John Easterling.
- Ex-sister-in-law of Michele Conaway and Matt Lattanzi.
- Rona Newton-Johns great-great-grandfather, was legal historian Rudolf von Jhering.
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