Your 3x Great Grandfather, John Currie, was probably owned by Hervey Currie. This 1860 Slave schedule shows Hervey has 1 male around 36 years.
The 1870 census on the next page shows your 3x Great Grandfather John Currie and his family living on/near the farm of Hervey Currie—
1940 Census shows John & Pearl Lee Brooks including his Mother-in-Law, Minnie Harris—who is listed as widowed. (This lets us know that Pearl’s mother was named Minnie and perhaps she named your grandmother after her.
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