Harrison County W.Va. Garrett's 1880

Looking for information on James and Roseanna Garrett.They came from Ireland sometime around 1850.My ggrandmother Mary Elizabeth Garrett was 7 years old at the time.She had a brother Robert.We believe he was born in this country.They settled in Harrison County, West Virginia.My ggrandmother married John E. Romine and moved to Bates County Missouri.Need information on her parents.They were on the 1880 census but that is as far as I can get with them.Any help would be appreciated.Thanks
Linda