Clarence Mackay and daughter - Glass negative photogrpah. Public domain.

Photograph shows financier Clarence Hungerford Mackay (1874-1938) with his daughter Katherine at the wedding of Kathryn N. Steele and Mr. F. S. von Stade which took place on June 26, 1915 at the Church of the Advent, in Westbury, Long Island. (Source: Flickr Commons project, 2012 and the New York Times, June 27, 1915)