The 1841 census - H0107/428/22/6/7 - in Rickmansworth lists with surname transcribed as ROWLIDGE: Robert age 31 Catharine age 28 Elizabeth age 9 William age 8 Alfred age 7 Emma age 5 Samuel age 3 Eliza age 1 I have all baptism records [except Emma's] and can confirm via GRO that the MMN for Samuel and Eliza was CLAY. When I view 1851 census - H0107/1714/399/10 - in Rickmansworth, Elizabeth, William, Alfred and Emma are not with them. Elizabeth [I have not found], William died in 1849, Alfred was working as a Baker's Lab [H0107/1714/399/10] and living next door and Emma died around the same time William died. At home were: Samuel age 12 Eliza age 11 John age 10 Susan age 5 Mary Anne age 2mos. They also had a son David [born 1843/died 1849] and a daughter Hannah [born 1848/died 1849]. With the exception of John I have confirmed MMN for the children born after 1837 as CLAY. John went on to marry Jane Woolard in Rickmansworth on 24 Apr. 1870. He is my 2nd Greatgrandfather. I cannot find anything on a birth registration in Watford Union which is the R.D. for Rickmansworth. The children that died late summer of 1849 - William, Emma, David and Hannah - all died of Cholera within days of each other.