i was so excited to find your post! this is my family too, although i didn't have quite as far back as you.
so far i agree with everything except that R.L. yerbey's name was robert e. lee yerbey. from everything i've found it was just robert lee (R.L.) yerbey. as for the other information, that's about what i've found. if you have anymore information and want to swap info, please email me. i have brothers and sisters and on down edward lee yerbey, sr.'s line going through his brother burrell henry yerbey sr. (who was my great grandfather).