Hi,

I found something very interesting. As you know, it was not unusual for former slaves to change there names. Well, I believe I found your family in 1870 with last name of KADE>>

1870 Red River County Texas

KADE, SAMPSON age 48 Farmer, born SC
KADE, PATTY age 20 born Tx
KADE, ELIZA age 6 female
KADE, EDMOND age 2 male

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In 1880, your family is listed by ancestry.com as LEUIS in Red River County Tx

Leuis, Sampson age 50 born Tenn, mother and father birth not listed
Leuis, Patsy age 36 wife born Texas mother and father birth not listed
Leuis, Eliza age 14 dau born Tx
Leuis, Ed? age 11 son born Tx
Leuis, Vina age 8 dau born Tx
Leuis, Katy age 6 dau born Tx

Note: The ages are little off from the 1870 census for Sampson and Patsy but it appears to me to be the same people in both census. And the place of birth for Sampson in 1870 was listed as South Carolina.