It's just a hunch, but I bet your Emerson is related to this Emerson
Thompson. Wellston is also in Lincoln Co., OK.

1920 Census McKinley, Lincoln Co., OK
Will J Thompson Head M B 40 married b. TN Father USA Mother TN Occu:
Farmer
Lucy T Thompson Wife F B 38 married b. TN Father TN Mother TN
Pearl Thompson Daughter F B 15 single b. TN Father TN Mother TN
Gladis Thompson Daughter F B 13 single b. TN Father TN Mother TN
Emerson Thompson Son M B 10 single b. TN Father TN Mother TN
Mary J Thompson Daughter F B 8 single b. TN Father TN Mother TN
James B Thompson Son M B 2yr 2mon single b. TN Father TN Mother TN

Social Security Death Index Record
about Emerson Thompson
Name: Emerson Thompson
SSN: 445-03-7336
Born: 28 Jan 1909
Died: Jun 1964
State (Year) SSN issued: Oklahoma