Trying to find 1861 census for John Mercer and his family.
John Mercer b. 1819 in Treeton/Bole Hill, Yorkshire.
Mary (nee Smith) b. about 1823 in Treeton
Elizabeth b. 1843 in Treeton/Bole Hill
Sarah b. 1847 in Catcliffe, Yorkshire.
Benjamin b. 1850 (baptized in Rotherham)
Selina b. 1854-1856 (unsure, can't find birth registration.)
Matilda b. 1856 Rotherham or Kilamarsh (one census says Rotherham, another says Kilamarsh)
1851 John is living with Mary, Elizabeth, and Sarah, in Yorkshire.
Can't find an 1861 census for any of his children either, so I'm assuming they're still living with him at that time.