Hi, i believe we have george tubb as a common ancester. George tubb Sr., married "mary"(I am still looking for details on "mary" if anyone can help), they produced many children one of whom was: George Tubb Jr.(who i believe is the brother of your ancestor Richard). George Jr. married Elizebeth Jane Floyd they produced: Lydia Tubb who married Alexander Moore and they had : Richard Andrew Jackson Moore who married Sarah Mae Gresham they had: Ella Jane Moore who married Joel Perry Robinson and they produced: Glen moore Robinson who married Annie Belle Buie and had child: Richard Lee Robinson Sr. who is my grandfather.
I hope this helps, I have many more details if I can help let me know. Rich