Thank you both, CJL & Scarbro, for such replies and for your efforts!
The GRICE/Simpson marriage and children match some entries I have seen in online, undocumented family trees. Now, I have a real source! Unfortunately, those same undocumented family trees give the John (who marries Ann Simpson) a second marriage to my Sarah GIB and then a whole additional set of children, so he would be having children over a 48-year span. I guess it's possible, but there is a GENUKI transcript of Baines's Directory of 1823 clearly showing two John Grice's in West Lutton. Now, with CJL's help showing that Grice/Simpson had a son John born in 1788, doesn't it seem more likely that the son is the husband of Sarah Gib? At any rate, I have enough info now to use to go through these parish records more thoroughly myself and see what turns up!
CJL, are these registers any more specific than just Weaverthorpe? Is a specific church mentioned?
As for the census listing, I have not been at all successful in being sure I've found the right people. I had discounted the one Scarbro lists, but now looking at it again, I guess it could be he and that the Mary Gobron listed in the household could be my John's daughter Mary (baptised Weaverthorpe 1818). This John's age sort of works with CJL's baptism data.
My ancestor is John's daughter Rachel who is married and in Emsall, West Yorkshire for 1841 & elsewhere in West Yorkshire for subsequent censuses. Also, I think I have son Christopher also in West Yorkshire for 1841. So, I've been looking there, too.
One more question: sometimes I see Weaverthorpe listed with East Yorkshire rather than Worcestershire. Is one right and one wrong?
Anyway, this is all enough to keep me busy for a long while. Thank you again, very, very much for your help!
--Encinita