For some reason or other my reply to you wouldn't go though on the regular e-mail so I will answer you this way.
I have the cemetery books so it is no problem for me to look up anything you would like.I find several listings for "Foster" in Longview Memorial and a couple for Cowlitz View Memorial.Both of the Roberts would be too young to have been Grace's step father. In Longview there is a Robert B. Foster born Oct 4, 1908 and died Oct 16, 1973 and in Kelso, WA. (Cowlitz View) There is a Robert H. Foster born April 23, 1891 and died Mar 16, 1969. Please let me know if I can be of further help to you. June