Carol,My name is Dee Ann Underwood and my grandfather was James Henry Mathias, who was a son to John.I really don't have much information on John Henry other than what I was given by my aunt.I hope it helps.
John Henry Mathias married Lucy Diadamia Thompson and they had 6 children. I may have their birth dates and death dates.
Benjamin F. Harvey Merle James Henry John Wesley Blanch Almira Arthur Roosevelt
You might find more information thru Lucy about John.I have searched for Hans and Louisa, but have come up empty.