Margaret Delancey

~• from wikipedia:

James De Lancey Family

James, on the 19th of August 1771 married Margaret, daughter of Chief Justice Allen of Pennsylvania. Five children of this marriage survived him: Charles Stephen, who served in the Royal Navy; Margaret, who wed Sir Jukes Granville Clifton, Bart.; Ann and Susan, who never married, and James, Lieutenant-Colonel in the First Dragoon Guard. None of the five had children. There are speculations with supporting evidence of tombstone inscriptions that De Lancey had a previous union with a connection of the Livingston family. Only her Christian name, Mary, is known. She died in 1770 leaving three children—John, James, and Mary. Through funds; believed to have been indirectly provided by the latter from his London exile, these children were reared and educated.
~• note: children by Mary did... in Canada
http://www.rootsweb.ancestry.com/~nsannapo/cemeteries/upper_clement...