Greenhills, Ohio, was one of three “Greenbelt Towns” built between 1935 and 1938 by the U.S. Resettlement Administration. (The other two are Greenbelt, Maryland, and Greendale, Wisconsin.) There are more Library of Congress photos of Greenhills here.
I think this was a 50th wedding anniversary celebration, and the couple were posing with their eleven children.
Michael Miley was a popular commercial photographer in Lexington, Virginia, who patented a color process in 1902 and may have produced the first color photographic print in the U.S. He died in 1918, so these photos must have been taken by his son Henry or another younger associate.
The Library of Virginia recently discovered 58 previously unidentified images by the Studio and hopes that someone will be able to help it identify some of the subjects in the pictures.