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Jemma and her husband Tim have two sons, Gabriel (born 1994) and Alfie (born 2000).
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She is married to Tim Owen Q.C., a London lawyer. He has written several legal text books, including Prison Law and Asset Recovery, and is an advisory editor of Blackstone's Criminal Practice.
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Jemma is a graduate of LAMDA - the London Academy of Music and Dramatic Art.
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Jemma is the daughter of Corin Redgrave, the niece of Vanessa and Lynn Redgrave, the cousin of Natasha and Joely Richardson, the grand-daughter of Sir Michael Redgrave and Rachel Kempson, and the great-grand-daughter of Roy Redgrave - all of them actors.