No luck for Eva, but I did find a trail for Leo.

SS death index
Leo W. Collard
b. 9 Oct 1912
d. Mar 1990 Upland, San Bernadino, CA
SS# 286-07-7785 Issued in Ohio

CA Death Index
Leo Willis Collard
SS# 280-07-7785 (transcription error?)
b. 9 Oct 1912 OK
d. 25 Mar 1990 Los Angeles
Mother's maiden name: Graves

1930 Littlefield, Lamb, TX
Kenneth R. Collord 30 (This is Malcolm?)
Clara 23
Clara M. 2 8/12
Leo 17 Brother

WW2 Enlistment
b. 1912 OK
residence, Wichita, KS
Enlistment 5 Feb 1943 Ft. Leavenworth

Hope this is helpful.