As far as I know Richard and Milly are as fare back as the Yeilding Yielding family research goes. I have a web sight on Yieldings and am happy to share the pages and pages of information with you.There are pictures and various Yeilding/Yielding family membors from all over the states stored there.I am sorry that I do not have it better orginized so that your search might be easier.Here is another Yeilding / Yielding message board.
http://genforum.genealogy.com/yeilding/I hope this helps you all.