Grant was born in Rothiemurchus in northern Scotland and studied art at the Slade School and in Italy and Paris. He was a cousin, and for some time a lover, of Lytton Strachey. Through the Stracheys, Duncan was introduced to the Bloomsbury Group, where John Maynard Keynes became another of his lovers. Vanessa very much wanted a child by Duncan, and became pregnant in the spring of 1918. Although it is generally assumed that Duncan's sexual relations with Vanessa ended in the months before Angelica was born (Christmas, 1918), they continued to live together for more than forty years.