That is very kind of you but I don't think you'll find anything for Lastra. I located Gladys' obituary (the individual born in Hiland) and it looks like she may have been the daughter of William H and Helen Brown instead of Frank and Helen Lastra. I believe that Helen married Frank later when she moved to Sheridan and in the 1920 census was listed as Frank's daughter instead of step.
If you wouldn't mind keeping an eye out for William H Brown, I'd appreciate it. I don't know if he died in Wyoming somewhere between 1910 and 1920 or if he left his wife and 4 children in Wyoming and left. Children were Mildred, William F, Marie, and Gladys. Older children were all born in Illinois.
William was probably born around 1875 in Illinois.