Mentions in newspapers:
Thursday, August 11, 1921
http://gateway.okhistory.org/ark:/67531/metadc139885/m1/4/zoom/Mr and Mrs C. H. Robinson spent the summer with relatives in Nebraska, for his health.
http://gateway.okhistory.org/ark:/67531/metadc161753/m1/3/zoom/Thursday, May 11, 1922
Mrs C. H. Robinson and daughter, of McAlester, staying in Talihina to be near their husband and father, a patient there.
http://gateway.okhistory.org/ark:/67531/metadc161754/m1/6/zoom/Thursday, May 18 1922
Mr C. H. Robinson, being treated at the state tuberculosis sanitarium in Talihina.
Charles Henry Robinson and wife Margaret arrived on the ship Saint Paul into Ellis Island, March 30th, 1911, and were originally heading to Omaha, Nebraska. Next of kin in the US is mentioned as a sister/inlaw, "Miss Mansfield", 2417 Dodge St, Omaha.
This is probably Isabella Mansfield living on Dodge Street in the 1910 census:
https://familysearch.org/ark:/61903/1:1:ML4Q-VG8She appears to have married Edgar O. T. Galloway:
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=142832273However Margaret and her daughter don't seem to have gone to Nebraska after Charles' death.
Margaret remarried in British Columbia in 1926, to a widower, Charles Beckwith Simpson
https://familysearch.org/ark:/61903/1:1:JD85-H71He died 1945:
https://familysearch.org/ark:/61903/1:1:FLL7-3L8Margaret died in 1968:
https://familysearch.org/ark:/61903/1:1:FLYQ-LK4her daughter, Marguerite Robinson, of Vancouver, was informant