Montague Browne married twice. His first marriage, in 1950 (dissolved 1970), took place in
Cheltenham and was to Noel "Nonie" Arnold-Wallinger. He had one daughter from his first marriage. He married secondly, towards the end of 1970 in
Wandsworth, Shelagh Macklin (née Mulligan), the former wife of racing driver
Lance Macklin. While working for Churchill, Montague Browne had an affair with
Jane Gillian Portal (1929−2023), one of Churchill's personal secretaries, from 1949 until her marriage to Gavin Welby on 4 April 1955 (Jane Portal later married
Charles Williams). In 2016, DNA tests showed he was the biological father of her son,
Justin Welby, the former
Archbishop of Canterbury, who was born on 6 January 1956. Montague Browne died at his home in
Bucklebury,
West Berkshire, on 1 April 2013. A memorial service was held on 25 June 2013 at
St Clement Danes Church on the
Strand, London. ==Ancestry==