Chamberlain family around Thongsleigh Farm

Trying to chase family of Roger Chamberlain who married Joan Webber nee Thorne in 1802. Children - Mary bpt May 1803 @ Cruwys Morchard, Ann bpt 1803 @ CM, Roger b 1811, Peter b 1810 and Eliza and Maria - the last two I haven't found their birth/baptism.   

Peter Chamberlain and wife (his cousin) Sally/Sarah nee Thorne - lived at Down House and Thongsleigh farm 1841 until Peters death 1875. Sally and her children emigrated to New Zealand 1876. 

Roger Chamberlain married Mary Ann and lived at Ford farm with him dying in 1876. I believe all 3 of their children died in 1870's so entire branch of this family died out?

Any help sorting this lot out would be appreciated