Based on the missing registers 1703-1723 my point was to find out how Jane Housden, Elizabeth Smith and Elizabeth Seabrooke are cousins, plus how Ann Townsend is her aunt.
As there are no wills or probates for Housden, Seabrook and Smith and Townsend from 1755 to 1820 the land they farmed and worked had to be handed down somehow.
Note Ephraim and Samuel Seabrook are listed as farmers of Dagenham in 1820.
Property disputes and how an estate is divided amongst heirs will list how and when they received it many years prior. Who died without heirs and who inherited their portion.
Many wills/probates have the wording to his/her heirs and the heirs of children born in the marriages.
I'm not referring to the Ephraim and Samuel of 1820 when we finally have a legal document concerning property division, but to their grandparents the generation you are looking for.
I could not find any Chapman's in Dagenham prior to 1703 so David was most likely born elsewhere.