I think I have found your husband's family on the 1930 census. If this is the right family, I found your husband's grandfather on the 1920 census as I am listing below. If this looks like the right Aults, I may have found the family in the 1880 census in Indiana also.
1930 Allen Co. Ohio, Lima City, Ed 18, Sheet 2A pg. 153
E. High St. rear 408
38-43 Forest G. Ault age 35, rents $20, age 35, 1st married at 25, b. OH, father b. IN, mother b. PA, Money Clerk Express Co.
Hazel wife, age 38, 1st marriage at 28 b. OH, father b. OH, mother b. OH
Dorothy daughter, age 8 b. OH, Donald son, age 5 b. OH, Charles son, age 4 b. OH, Raymond son,age 10/12 b. OH
This 1920 census was very faint and hard to read, but I could read Forrest's name very well.
1920 Allen Co. Ohio, Ottama? township, Lima City, 3rd Ward, ED 29, Sheet 1A
622 South Union St.
7-7 Gillian A. Ault age 53 b. IN, father b. PA, mother b. IN, Truck Driver for ?
G____? wife age ?, b. OH, father & mother b. PA
Forrest G. son age 25 b. Oh, Machinist ? Works
Opal ? daughter age 16? b. OH
Herbert son, age ? b. OH
Martha daughter, age ? b. OH
1930 Allen Co. Ohio, Lima, Ward 6, Dist 34, Sheet 4B
788 South Elizabeth St.
92-99 Walter Britt Sr. age 23, 1st marriage at 21, b. OH, NY, PA, Driver taxi cab
Martha wife age 18, 1st marriage at 17 b. OH, OH, PA
Walter A. Jr. son, age 1 6/12
James Dwight son, age 6/12
Gillene A. Ault father-in-law age 61, married, first marriage at 21, b. OH, PA, PATrucker Relay Motors