The 1880 U.S. Census lists Rebecca Bentley (Meads) as a person of mixed-race.
"United States Census, 1860", database with images, FamilySearch, Rebecca Bentley in entry for Jesse Collins, 1860
1. Dwelling houses—numbered in the order of visitation: 193
2. Families numbered in the order of visitation: 285
3. The name of every person whose usual place of abode on the first day of June 1860, was in this family: Jesse Collins, Caroline Collins, Ella Collins, Rebecca Bentley
4. Age: 42, 32, 7, 27
5. Sex: M, F, F, F
6. Color (White black, or mulatto): M, M, M, M
7. Profession, Occupation, or Trade of each person, male and female, over 15 years of age: Steward, [ ], [ ], Seamstress
8. Value of Real Estate: 2000
9. Value of Personal Estate: [ ]
10. Place of Birth, Naming the State, Territory, or Country: Tennessee, Georgia, Kentucky, Louisiana
. . .
12. Attended School within the year: [ ], [ ], /, [ ]
13. Persons over 20 yrs of age who cannot read & write: [ ], /, [ ], [ ]