- Oriane had French ancestry from her mother, Evelyn Raymonde Louise, daughter of Commandant Hubert Mijouain of Paris.
- Elder sister of barrister and former front-line Conservative politician and Attorney General, Dominic Grieve QC.
- Daughter of William Percival Grieve QC, MP for Solihull from 1964 until his retirement from Parliament at the 1983 general election.
- Studied drama at The Arts Educational, then based in the Barbican.
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