Mary - I first found THOMAS FIVECOAT and his children on the 1900 Justice Precinct 1, Jackson Co., Texas Census - transcribed below:
Head of household, THOMAS FIVECOAT, age 49, widowed, born Nov 1850 in Ohio, parents born in Ohio, he is a farmer.
Son, CHARLIE FIVECOAT, age 17, born March 1883 in Nebraska.
Son, WILEY B FIVECOAT, age 15, born Sept 1884 in Nebraska.
Son, IRA B FIVECOAT, age 13, born Jan 1887 in Nebraska.
Daughter, MARY FIVECOAT, age 12, born March 1888 in Nebraska.
Daughter, MARTHA FIVECOAT, age 10, born Dec 1887 in Nebraska.
Since the FIVECOAT children were born in Nebraska, I decided to try to find this family on the 1880 Nebraska Census - I found THOMAS, HARRIET and their children on the 1880 Bryant, Fillmore Co., Nebraska Census - transcribed below:
Head of household, THOMAS FIVECOAT, age 29, born in Ohio, father born in Ohio, mother born in Virginia, he is a farmer. (There is a notation that THOMAS was suffering from "chills and fever")
Wife, HARRIET FIVECOAT, age 30, born in Indiana, father born in Virginia, mother born in New York.
Daughter, ADDIE FIVECOAT, age 6, born in Iowa.
Son, FRANK FIVECOAT, age 4, born in Iowa.
Son, ROBERT FIVECOAT, age 3, born in Iowa.
Son, BERTIE FIVECOAT, age 11 months, born July in Nebraska.
On Ancestry.com I found several "family trees" that contain your THOMAS N FIVECOAT (FIVECOATS) and HARRIET REBECCA HUGHES.
Here is the information for HARRIET REBECCA HUGHES - born Oct 23, 1849 in Indiana and died Aug. 18, 1893 in Edna, Jackson Co., Texas. She is the daughter of Montraville Hughes and Harriet Ann Fuller.
One individual that had information on this family used the "FIVECOAT BIBLE" as the source. The contact information for the person that actually has possession of this Bible is PATRYKA TACHICK, P. O. Box 573, Sandia Park, New Mexico 87047.
The contact information for the person that posted this information is AMY - (email) firstname.lastname@example.org.
In case you don't have this information on your THOMAS N FIVECOAT - he is buried in the White Oak Cemetery in Porter, Montgomery Co., Texas. I found him on the website, findagrave.com. His Memorial # is 19946329. His grave marker reads "Father - Nov 12, 1851 - April 6, 1934.
Another family tree on Ancestry.com is "owned" by mfarrar, who lives in Edmond, Oklahoma. The name of his family tree is "FARRAR-OUSLEY-SHEFFERD - HUGHES FAMILY TREE".
If you do not subscribe to Ancestry.com, I would be glad to send this "Farrar" individual a message for you. Just let me know.
Hope that this information helps you in your search and that you will be able to make contact with these "cousins" you didn't know you had!