Ancestry.com trees have the wrong death information for the daughter born in 1936.
Roy Robert's daughter was born late May or early June 1936:
The Spokane Press
Wednesday, June 3, 1936
Page: 8
To Mr. and Mrs. Roy Robert Kirk, Medical Lake, a daughter, Sacred Heart [the hospital in Spokane, probably]
The ancestry tree says she died 3 August 1986. But the woman who died on that date was survived by a mother Helen, in Buffalo, Kansas,
from Spokane Chronicle
Monday, August 4, 1986
Page: 21
KIRK, Mary E. Passed away August 3, 1986.
and that lady seems to have been born on 21 Oct 1936, based on a Social Security record of a Mary E Kirk who died in 1986.