Tennant was the third daughter of Charles Tennant (1796-1873) and Gertrude Barbara Rich Collier (1819–1918). She married the classicist and psychical researcher Frederic William Henry Myers (1843-1901) in 1880. They had two sons, the elder the novelist Leopold Hamilton Myers (1881–1944), and a daughter.
Tennant took up photography in 1888, taking pictures of her family and visitors.
- Crompton, Sarah (6 May 2016). "She takes a good picture: six forgotten female pioneers of photography". London: The Guardian. Retrieved 9 May 2016.
- Gauld, Alan (2004). "Myers, Frederic William Henry (1843–1901)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/35177. (Subscription or UK public library membership required.)
- Waller, David (2004). "Tennant, Gertrude Barbara Rich (1819–1918)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/55520. (Subscription or UK public library membership required.)
- Hamilton, Trevor (2009). Immortal Longings: F.W.H. Myers and the Victorian search for life after death. Imprint Academic. ISBN 978-1-8454-0248-8.
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