Here's a post with a discussion of two cousins of yours:
http://boards.rootsweb.com/thread.aspx?o=20&m=2.3.18.20.1&p...
In the discussion it identifies your grandmother having two brothers. A Raymond Mayhorn and a Lawrence Mayhorn.
This appears to be a 1920 Census of your grandmother's family:
https://www.familysearch.org/ark:/61903/1:1:MHPZ-36R
From there you'll need to find out what Elizabeth's maiden name was. One way to do this would be to look at death certificates for Icel and all of her siblings to see if it was recorded in those records.
Scott,
I certainly am overwhelmed to see this post and read its content. Reading what Debbie said about Raymond and Icel was fantastic. I am the youngest daughter of Icel's 2nd son Cecil Francis Jr., i have 1 living sister. I would love to know more, how can i find out about Debbie? I knew grandma Icel lost children at birth but not how many. There were 2 boys who lived and 4 daughters that i can recall. All my aunts now are gone and so are the boys. We thought the Hatfield link was through Icel's mom Elizabeth Mayhorn but cant quite get it found.