I am especially interested in anything you might know of Otto/Otho Malott and his family. I have Otto Malott m. Margaret Beatty in Jefferson County, Kentucky in 1821. At some point they moved to Lawrence County, Indiana where they are found continuously in the census from 1830 through 1860. Either they left the region or they died because I haven't found them in 1870 or 1880.
I am reasonably sure this is the same family as your Hiram & Mary's family. Otto's son, George F. Malott, named a son Volney also. It is a rather unusual name and most likely travels in families.