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I can't tie all of this together but maybe you can at a later date as I do believe that your Allen's came from Tallapoosa AL, and possibly before that from Merriweather, Georgia.
The TX Death record of Leonidas Augustin Upshaw shows born 9 Sep 1855 and died 9 Sep 1855. It shows his parents as Middleton Upshaw and Susan Berry. Death records are not always dependable.
I can see a marriage record of Leonidas A Upshaw and Jerusha E. Humphries on 16 Nov 1879 Tallapoosa AL, and a POSSIBLE earlier record in Merriweather GA. The wife's name is consistent with records I found in Texas.