Hi Amanda
William was the son of Thomas Oxby b 1812 Little Hale d 1868 Sleaford and Elizabeth Harvey b 1817 Kirton in Holland d 1883 Sleaford, his siblings were;
Harvey b 1847 d 1902 Heckington, Thomas b 1848 Elizabeth b 1858 and Edward b 1845.
Harvey was my Gt Gt Granfather.
I hope this helps
Rosi