Hi, Just got back from PRO and luckily I found a copy of the marriage from April 1820 at Charles Church, unfortunately back then it didnt show parents but there was one other Yeo mentioned being a witness alongside Wm Palkinghorn and she (i believe) was called Marey Ann Yeo, I didn't get much time in there to look due to it being busier than any other times I have been in there, and have also got this from family search
Edward Yeo
England Births and Christenings, 1538-1975
residence: Devon, England
parents: Edward Yeo, Ann
Mary Ann Yeo
England Births and Christenings, 1538-1975
residence: Devon, England
parents: Edward Yeo, Ann
Betsy Yeo
England Births and Christenings, 1538-1975
death: 28 Feb 1798
residence: Devon, England
parents: Edward Yeo, Ann
John Yeo
England Births and Christenings, 1538-1975
residence: Devon, England
parents: Edward Yeo, Ann
these were all baptised in same church in Stoke Damerell, there are 2 others that show with parents called Edward and Ann but they were from Holsworthy so whether or not they lived there originally I dont know