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From what I have heard, there was no love lost between Henry Toal and his step sons, Almaren and Hillard, so when Hillard came to Forney Texas, we assume he didn't bring his stepfather and mother with him. I found the cemtery where Hilliard and his descendents are buried, but no Toals. The are also not in the Prairie Grove cemetery where Roseanna, Hugh, and Charle toal's wife are all buried, so like you, I assume they are somewhere in Arkansas but I have not found them yet.
* Im descended from Henry & Polly Wilson Toal's daugher, Roseanna toal who married Hugh McDuffie McAfee. Some Rosanna info posted at the Navarro County TXGenWeb site in the Hugh McDuffie McAfee biography page.