Your Gallaher family members are much too recent to match with my records. My grandmother, Martha Malinda Gallaher was born August 25, 1841 and died Jan. 07, 1931. She was the daughter of James Herbert Gallaher and Isabella McClure. Their children were: 1. Sarah A., 2. Robert, 3. Eliza Jane who married Robert Blackton Allen, 4. George G., 5. Hamilton H. (he went with two of his brothers to the Gold Rush in California and died there in an accident. One brother stayed in CA, the other returned to Missouri. 6. William Wilson, 7. John A., 8. Mary Ann who married Ninevah Gideon Barnes, and lived in Grayson Co., TX, 9. David T. killed in the battle of Chickamonga during the War Betwwen the States, 10. William E., 11 James H. who was killed in the Battle of Corinth, MS during the War Between the States, 12. my grandmother, Martha M. 13. Charles P. and finally 14. Samuel Gallaher.
If you can tie your family in with any of these names, contact me at firstname.lastname@example.org and I can send you a lot of information on Gallaher family ancesters.
Also type Roane County, Tennessee into a search engine.