Your grandparents, that is wonderful so nice to meet you. But I must tell you they are no relation to me. I do a lot of re-posting to help everyone out. My grandfather was born in Iowa, and while I wait to see something on his family I do this.
Did you take a look at my posting history? There are HUNDREDS of articles from that area of Iowa, there could be more for you and I just don't know it. If you don't know how to get in there just let me know.
I did a quick check at the site where the articles come from originally: www.rootsweb.com/~iadecatu There is a "surname notebook" and four of five people are researching the Smith surname, one in particular is interested in the Garden Grove area Smith's and that sounds like you. So you may want to take a look. You can subscribe to the site, it is free and the people are great, would love to see you there.