Hi.
Welcome to Rootschat Bob2000.

I am afraid that I am one of the endless folk related (although distantly) to the
Yeoman's of Desborough, Coe's and Marlow's.
The Joseph who married in Newton was from Rothwell (at time of Marriage)
only a mile down the road.
I could look at the original marriage certificate later in week if no helps beforehand
to see if there are any clues.
You say that Ann and Martha have died before the 1841 census, I can certainly see
a burial for girls with that name being buried there, as over 18, yet the only John and
Elizabeth on the N.M.I. is for a John Yeomans to an Elizabeth Moore in 1802.
Therefore could you confirm for us where you found the details of the children dying please.
Sandy