There is a good chance that your great-grandfather Augustus is a son of the Louis Mousseau family of Iowa County.A son August of Louis is listed as having been born in 1858 in Iowa County, Wisconsin and 'moved west.'I have not tried to search for more information on August, but will now that we have a possible connection through you.It is interesting that the son, your grandfather, has the name Louis - which of course is often a pattern followed by european families.
I have the Mousseau ancestry from Louis for several generations back, mainly due to the efforts of several your 'cousins.'
My wife's mother's mother was Sophronia Mousseau, a sister 'possibly' to your Augustus.
I can send some ancestral charts via e-mail by Tuesday evening.
Later in the week I'll look for information on Augustus in the Iowa County marriage and birth records.
Were their other children of Augustus and Mary (Marie) besides Louis August Mousseau? Any additional names (surname or given), dates, places ... would help.
Myron Bergenske 118 Maiden Street Mineral Point, WI53565-1517