There is no trace of William by the time of the censuses.
Baptism Name: William Brown Residence Place: Gender: Male Christening Date: 02 Jan 1831 Christening Date (Original): 02 JAN 1831 Christening Place: SAINT LEONARDS,SHOREDITCH,LONDON,ENGLAND Birthplace: Birth Date: 23 May 1825 Father's Name: William Brown Mother's Name: Harriet Indexing Project (Batch) Number: C04080-6 System Origin: England-ODM GS Film number: 396238, 396239, 396240 Reference ID: Citing this Record: "England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NLJX-4M9 : 6 December 2014, William Brown, 23 May 1825); citing SAINT LEONARDS,SHOREDITCH,LONDON,ENGLAND, index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 396,238, 396,239, 396,240. (see image)
It may be possible to confirm family relationships with William by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with William: