- Son of photographer Mark Fiennes and novelist/painter Jini Fiennes (AKA Jennifer Lash)
- Father of daughters Cheyenne Allegra (b. 9 December 1996) and Shanti Atalanta (b. 19 November 1997).
- Full name: Magnus Hubert Twisleton-Wykeham-Fiennes.
- Brother to actors Ralph Fiennes and Joseph Fiennes and director/producers Martha Fiennes and Sophie Fiennes.
- Son of photographer/illustrator Mark Fiennes (né Mark Twisleton-Wykeham-Fiennes) and novelist/painter Jennifer Lash (née Jennifer Anne Mary Alleyne Lash; aka Jini Fiennes).
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