Just to recap on Thomas CARR and Elizabeth (tree on Ancestry gives Elizabeth's surname as PALMER)
The two youngest children on the 1841 census is
Emma aged 3 and Eliza aged 1
GRO INDEX
CARR Eliza - mother's maiden name JONES - 1839 S Qtr Newbury
CARR Emma - ditto - 1837 -
and then
CARR ANN - 1842 mother's maiden name JONES - Newbury
Is there another marriage of Thomas CARR to Elizabeth JONES - the oldest child on the 1841 census is Sarah aged 14. c 1827 all born in the County and later census' Newbury, Berkshire.
There is a tree on Ancestry : Thomas CARR 1807 to Elizabeth JONES - 1808-1890 (again no parentage).
Sarah CARR their daughter - born 1826 - in Newbury, Berkshire, married
William Hambleton BEALS - born 1823, Barford, Norfolk - Civil Reg. Marriage - Jan 1847, Newbury, Berkshire to Sarah CARR.