She married the television producer Barrie Edgar in 1943. The couple had first met when she performed as an acting student at the Birmingham Repertory Theatre in the late 1930s. They lived in the Edgbaston district of Birmingham in retirement. Their son David Edgar became a successful playwright. He had been encouraged in this pursuit by his father, starting to write plays at the age of five when his father constructed a small wooden theatre for him. Their daughter Kate also entered the theatre, as a composer and musical director. Their other daughter, Sarah worked as an environmentalist. Barrie survived Joan.
- Hallam, Katy (2 January 2013). "Pioneering Birmingham TV producer Barrie Edgar dies, aged 93". Birmingham Mail. Retrieved 25 July 2014.
- "Barrie Edgar". The Telegraph. 6 January 2013.
- "Desert Island Discs - Castaway : Joan Edgar". BBC Online. BBC. Retrieved 25 July 2014.
- O'Mahony, John (20 March 2004). "Profile: David Edgar". The Guardian.
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