Greenberry is listed under Jackson G. Douglass in marriage to his daughter Madaline.
There is also an Esther Seaver d/o Jacob Seaver that married Charles Campbell.
There is also a Green L. Seaver that married Margaret Wade.
Having just started you may have already found most of the information I have, but I would be willing to share anything I have found, and would be interested in information or a Gedcom if you have one. --Lee Carpenter