Denis Mitchison British microbiologist (1919-2018) (1919–2018) Parents Naomi Mitchison Dick Mitchison, Baron Mitchison Children Graeme Mitchison Siblings Sonja Lois Mitchison Geoffrey Mitchison Murdoch Mitchison Valentine Harriet Isobel Dione Mitchison Avrion Mitchison Partners Ruth Sylvia Gill Honora Carlin