I am trying to find John Henderson and wife Catherine Olivia. Birth dates of both are unknown. They should have a son John approx 20 years of age., Possible siblings Ann, Charles. I have been told that they lived in the Allenport area of Washington County. The year for this is unknown. A note on the Mon Valley web site says Mrs. Henderson died about 1918, (For other searchers The referenced Note..... Look for Terry Hewitt's notes, They list a large number of names and events.) Thank you Grant