Pliny Irwin (b.1837, New York, d.1906, Michigan). His parents were Isaiah Irwin and Emily White.
Susan Hull Irwin (b.1840, Ohio, died in Michigan). Her parents are not known.
These pictures were taken in Indiana. Best guess is the portraits were taken about 1905.
The original photographs are in the Linn County Historical Society Museum in Pleasanton, Kansas. They are part of the collection donated by Ivan Irwin.