i have traced my mccrea family tree to the griggs

great gr. gr. gr. gr. gr. grandparents
phillip grigg
elizabeth randall married in oct. 18. 1770 in st. nicholas at wade, kent, england

kids need info
john grigg sr. 1772 - 1837
mrd: sarah wooten grigg 1771 - 1843
on july 6, 1793 in st. nicholas at wade, kent eng.

kids:
john grigg jr. 1795 - dec 18, 1876
married susanna holmes grigg 1787 - 1875
john was born in minister in thanet, kent england
mrd on oct 14, 1820 in minister in thanet, kent england burried in durham county england

hids unknown except sarah grigg (great gr. grandmother)

married thomas corbett of eng.

sarah was brn: aug 13, 1851 in st. just in roseland, cornwall england she later married john hopper sr. her kids unknown except

mary francis corbett (great grandmother)1872 - 1937
married james mills mccrea jr. 1860 -1941
kids clifford, frank and sarah etc..
these are my grandfather and his siblings

any information about these people and any others related would be greatly appreciated i hope the cornwall clue will prove fruitfull
thank you very much....