Killing them off

[Phoenix]

Henry Richardson and Elizabeth Field had 8 children (that I know of):

James 1783 - 1855
Ann 1788 -1849 (m Charles Pierce)
Henry 1796 - 1836 (died aged 40 mere weeks after his father died aged 81)
William 1798 - 1843
Michael 1801 - 1844
John 1803 - 1836 (1836 was not a good year for the family)

so far so good

Can anyone spot what happened to Sarah bp 29 aug 1785 Shermanbury
and Mary bp 27 Dec 1790 Cowfold?

The trees on Ancestry are embarassingly wrong.