1861 Census of England & Wales (RG9/1984 f35 p13), Tettenhall, Staffordshire, Alexander W. Thorneycroft, age 2, son of Thomas Thorneycroft, Iron Master. Accessed at Findmypast (http://www.findmypast.com)
It may be possible to confirm family relationships with Alexander 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 Alexander: