I've been researching Gillhams and their kinfolk for about 17 years. Several years back, I purchased a copy of a Kirkpatrick book which contains considerable information You might like to try checking to see if your library might be able to obtain a copy, if not, I believe the price was close to 40 or 50 bucks. Here's the info:
"A Kirkpatrick Genealogy - The Family Of James Kirkpatrick Of South Carolina ca 1715 - 1786, 2nd edition - Edited by Melvin E. Kirkpatrick and David Hudson - 1995 - Library of Congress Catalog Card Number 96-75025 - printed by the Anudsen Publishing Company, Box 230 - 108 Washington Street, Decora, IA 52101 this is an update to the original compiled and published by Melvin Kirkpatrick some 10 years or so earlier. The information from the above will be found to be concentrated under the descendants of the above family, however, some will be found in other lines, as some of their descendants intermarried with other of Thomas Gillham's descendants.
I'd appreciate any information from you pertaining to you, your siblings, parents, children, etc so I could update my database of close to 56,000 names. I have added what you posted, lineage wise, but names, dates, locations, etc would be greatly appreciated.
Herb Gillham, 2700 Highway 67 (MO Av.), Granite City, IL 62040-2029.