Son James was b 1820
Last child was b 1827 according to parish records - but - this is the family of the Thomas Walton who married Mary Dawson in 1828:
1841 shows Hannah 13,  Mary 11,  James 9, Jeremiah 7, Susan 2 and a Thomas DAWSON  aged 20
HO107 Piece 552 Book 5 Folio 7 Page 6
Births June qtr 1839  
 
Susan Walton   Todmorden  21 774 
The children are Walton in 1851 and Thomas Dawson is shown as son in law meaning stepson