I would like to know the maiden name for the wife of Willard French. Her name was Margaret French. Does anyone know what happened to them?

1850 United States Federal Census, District No. 105, Sullivan County, Indiana, 24 September 1850.
French, Willard. age 41 born Kentucky, farmer, Value of Real Estate 175
French, Margaret age 36 born Kentucky
French, Meiranda age 20 born Kentucky
French, Benjamin age 18 born Kentucky, laborer
French, James H. age 15 born Kentucky, laborer
French, William C. age 13 born Kentucky
French, John C. age 9 born Kentucky
French, Sarah. age 3 born Indiana
French, Louisa age 10 months born Indiana
Shanks, John age 12 born Indiana
Shanks, Rhoda age 9 born Indiana