Arthur Lawson Johnston, 3rd Baron Luke British peer (1933-2015) (1933–2015) Parents Barbara Anstruther-Gough-Calthorpe Ian Lawson Johnston, 2nd Baron Luke Children Rupert Arthur Lawson Johnston Ian Lawson Johnston, 4th Baron Luke Sophia Charlotte Lawson Johnston Rachel Honoria Lawson Johnston Siblings Ian Harry Calthorpe Lawson Johnston Philip Lawson Johnston George Andrew Lawson Johnston Caroline Jean Lawson Johnston Partners Sarah Louise Hearne Silvia Maria Roigt