Born in Belfast, he was the youngest son of a
Protestant family of twelve, six of whom survived. He was educated at the
Royal Belfast Academical Institution. His father, Robert Reid (1825–1881), was the manager of a felt works, having failed as a shipowner at
Liverpool, and came from a well-established upper-middle-class Ulster family; his mother, Frances Matilda, was his father's second wife. She was the daughter of Captain Robert Parr, of the
54th Regiment of Foot, of the landed gentry Parr family of
Shropshire, related to
Catherine Parr, last wife of
King Henry VIII. Reid entered
Christ's College, Cambridge, in 1905, graduating BA in medieval and modern languages in 1908. He returned to Belfast, and met
E. M. Forster, who remained a lifelong friend, in February 1912. After graduation Forster continued to visit Reid, who was then settled back in Belfast. In 1952, Forster traveled to Belfast to unveil a plaque commemorating Forrest Reid's life (at 13 Ormiston Crescent). ==Works and influences==