Please can you find a census record for Oswin Griffiths for 1851?
On 11 July 1842 in West Bromwich he married Fanny Taylor. They had one child - Rosabelle Griffiths (b. 1846). It seems they may have separated.
In 1851 Fanny Griffiths was living with her daughter Rosabelle at the home of her uncle Timothy Massey in Birmingham St George. In 61 Fanny was living with Rosabelle in Birmingham and in 71 and 81 with Rosabelles family (Thomson) in Shropshire.
From 1854 Oswin had ten children with Rebecca (Wood). No marriage record found; although Rebecca uses the surname Griffiths. In 1861 they lived at Back 280, Birmingham, in 71 at Weston Lane, St John, Staffordshire.