Hi Cherie
I've been looking into Clifton for you. Hopefully the following will be of help.
In the 1841 census Philadelphia Clifton b 1771 in Kent (age 70) was residing in Burgate Lane, Canterbury with John Clifton b 1816 Kent a Wool Comber. I'm assuming John was Philadelphia's grandson - the dates and ages would fit for this.
There is a death record of Philadelphia Clifton in the September quarter of 1852 in Canterbury. Again, this would fit.
Regarding Philadelphia Clifton, your 4th g.grandmother, I have found eleven of the 12 children (in no particular order):
ELIZA ANN - 15 Sept 1823 Sussex
JAMES - 14 April 1825 Sussex
EDWARD - 9 Jan 1827 Sussex
RHODA - 10 July 1833 Sussex
HENRY - 12 July 1831 Sussex
MARY ANN - November 1820 Kent
PHILADELPHIA - 26 June 1819
ANN - October 1829 Sussex
LOUISA - 15 May 1836 Sussex
HARRIET - 8 January 1842 Middlehope, New South Wales, Australia
SARAH ANN - 1838 New South Wales, Australia
I am ASSUMING the twelfth child was indeed John as mentioned previously who was residing with what could be his grandmother in the 1841 census.
I have also found marriages for two of the children:
Eliza Ann married JOHN TUCKER on 20 January 1848 in New South Wales, Australia
Rhoda married JAMES WEEKES in April 1850 in New South Wales, Australia
A death record of Rhoda has presented itself also - 4 December 1887.
Hope this information is useful to you.
Kay