Household of William Mercer (born 1841, Lancashire)

In the 1881 Census, the household of William Mercer, born in 1841 in Lancashire, consisted of 18 members. William was the head of the household, married to Ellen M Mercer, born in 1850 in Exeter, Devon, England. They had 5 children; Richard E (born 1874 in Pickering, Yorkshire, England), Edith E (born 1876 in Pickering, Yorkshire, England), Alexander A (born 1876 in Leeds, Yorkshire, England), Robert H (born 1879 in Ilkley, Yorkshire, England) and Ada P (born 1881 in Ilkley, Yorkshire, England).
During the period, also present in the household were William's Governess, Martha (born 1857 in Shropshire, England), William's Servant, Rose (born 1863 in Hull, Yorkshire, England), William's Servant, Harriet (born 1864 in Grimsby, Lincolnshire, England), William's Teacher, Victor (born 1859 in Westminster, Middlesex, England), William's Pupil, Evelyn (born 1867 in Doncaster, Yorkshire, England), William's Pupil, William (born 1867 in Clitheroe, Lancashire, England), William's Pupil, Julius (born 1868 in Hyde, Cheshire, England), William's Pupil, Thomas L ? (born 1871 in Blackburn, Lancashire, England), William's Pupil, Robert (born 1872 in Yorkshire, England), William's Pupil, William (born 1873 in York, Yorkshire, England) and William's Pupil, Robert (born 1874 in Blackburn, Lancashire, England).