The William and Margaret Hudson family can be found on the 1850 US Census living in District 44, Ohio County, Virginia (which is now West Virginia).
The family is listed as follows on the 24th of October in 1850:
William Hudson, 32, Male, Born in England, Occupation: Brewer
Margrt, 32, F, England
Mary M, 11, F, England, Attended School within the year
Benjamin W, 9, M, England, Attended School within the year
Ann, 4, F, England
Elizabeth, 6/12 months, F, Born in Virginia
Thomas Lutz, 22, M, Germany, Brewer
John Butterfield, 22, England, Brewer
Emma Hudson, 2, F, England
Source Citation: Year: 1850; Census Place: District 44, Ohio, Virginia; Roll: M432_966; Page: 163B; Image: 332.
Ancestry.com. 1850 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2009. Images reproduced by FamilySearch. Original data: Seventh Census of the United States, 1850; (National Archives Microfilm Publication M432, 1009 rolls); Records of the Bureau of the Census, Record Group 29; National Archives, Washington, D.C.