MRCA info

Some new stuff:

Robert Carter⁷ Austin Jr. (Robert Carter⁶, Clyde Bernard⁵, Clisbe⁴, Clisbe³, Archibald², Edward Riggs¹) 

Then there is your line:

Horace Lester⁷ Riggs III (Horace Lester⁶, Horace Lester⁵, John Woodson⁴, Samuel³, Clisby², Edward Riggs¹) 

For all 3 of you the line above Capt. Ed Riggs(1720-1820)  is the same:

Capt. Edward⁵Riggs (Samuel⁴, Edward³, Edward², Edward¹ (b.1590))

Clyde Bernard⁶ Austin III (Clyde Bernard⁵ Jr., Clyde Bernard⁴, Clisbe³, Clisbe², Archibald¹)

Robert Carter⁶ Austin Jr. (Robert Carter⁵, Clyde Bernard⁴, Clisbe³, Clisbe², Archibald¹)  

William Luther⁷ Austin (William Brinks⁶, William Thompson⁵, Robert White⁴, William Thompson³, Clisbe², Archibald¹)

MRCA is Clisbe Sr.

John E⁶ Austin (E Woodrow⁵, Jacob E⁴, William³, Archibald II², Archibald¹)

MRCA is Archibald, himself.

Roy Burdine⁷ Riggs Jr. (Roy Burdine Sr.⁶,William E⁵, Henderson E⁴, Jesse Jr.³, Jesse Sr.², Edward¹)

MRCA is Edward Riggs

Roy and Robert have a 38 at marker 34. So we must conclude that Edward Riggs had the same. This is a mutation from the Ed Modal Sig. which has a 37 there.

Roy has a 17 at marker 33, which is a mutation from Ed Modal Sig. which has a 18, just like Robert.  Therefore this mutation took place at Jesse Sr. or lower.

The mutation at marker 47 for Robert... he has a 9 there. Roy has a 10 like the Ed Modal Sig. Thus the mutation has to occur below Capt. Ed.... either in Archibald or in Clisbe Sr. We will know the answer to this when John E takes the test. 

Horace Lester Riggs

(Horace Lester7 Riggs III, Horace Lester6, Horace Lester5, John Woodson4, Samuel3, Clisbe2 Riggs, Edward Riggs1)

Clay Austin

Clay7,Joseph C6, Joseph C5, William4, Archibald3, Archibald2, Ed Riggs1

Nancy Lynne⁷ Austin (Gerald Winston⁶,Clisbe Emerson Jr.⁵, Clisbe Emerson Sr.⁴,  Archibald³, Clisbe², Archibald¹)

E Ray6 Austin (Luther5, Thaddeus4, Elanza3, James2, Nat1)
Ben Jr.6,Austin (Ben Sr.5, William4, Elanza3, James2, Nat1)