Ann was born in London in 1916, the daughter of Adrian and Karin Stephen. She was already married (to R. Davis) when she met Synge during her final year as a medical student in Cambridge. Ann was divorced ca 1942 and Synge and Ann married in 1943.
Ann and R.L.M. Synge had eight children: Jane (born 11 April 1943), Elizabeth (3 May 1944), Thomas Millington (6 September 1945, died in childhood), Matthew Millington (25 January 1948), Patrick Millington (7 January 1951), Alexander Millington (29 May 1953), Charlotte and Mary (18 June 1955).
Perrin was a French physicist whose work on Brownian motion provided the first demonstration of the existence of atoms. In 1910 he became Professor of Physical Chemistry at the Sorbonne. He was awarded the Nobel Prize in Physics in 1926.