- Older sister of Christian rocker Phil Keaggy (and Glass Harp front man) Phil Keaggy.
- Daughter Molly (known as Moll Anderson) was born during Kay's first marriage to a New York cosmetics executive. She is a Lifestyle Expert/Celebrity Interior Designer in Nashville, TN, with one child, a son, Michael.
- As of 2002 she was living in Phoenix, AZ.
- In an interview from August 14, 2018, with the Cultivated Podcast, Kay's brother, Phil Keaggy, said that Mary Ellen had died recently, at the age of 88.
- Son Bill was born during Kay's second marriage to Tim Ruffalo. Bill has three daughters -- Cortney, Tiffany and Molly.
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