In 1913 Morley completed his Oxford studies and moved to New York City, New York. On June 14, 1914, he married Helen Booth Fairchild, with whom he would have four children, including Louise Morley Cochrane. They first lived in Hempstead, and then in Queens Village. They then moved to Philadelphia, Pennsylvania, and in 1920 they made their final move, to a house they called "Green Escape" in Roslyn Estates, New York. They remained there for the rest of his life. In 1936 he built a cabin at the rear of the property ("The Knothole"), which he maintained as his writing study from then on.