I think that you are talking about Benjamin Franklin Speer, Jr born about 1826 in TN or AL. He is the son of BF Sr and Elizabeth Nutt. His wife was Mary Elizabeth McFarland married 9/2/1826 in Dallas Co, AR. They had 6 kids and Amanda was the youngest.
You can find them in Ouachita Co, AR in 1850. I think that BF Jr had a first wife Mary A.
In 1860 and 1870 they are in Dallas Co, AR.
I've got more info on them. I'm related to the Speer, Nutt, and maybe the McFarland family. You can email me at firstname.lastname@example.org