My aunt, Ole, did a lot of research on the Walling- Glenn family tree. Her book can be found by clicking the following link (NOTE- THIS IS A HUGE FILE AND WILL TAKE A FEW MINUTES TO DOWNLOAD):
You can click on either of the images below and they should "Pop-up" a little clearer.
Root of family tree from Ancestry.com starting with me:
From James Walling in above root tree. Parents of James are John Walling and Anna Chisum:
From Thomas Walling in above Walling branch of tree. Parents of Thomas are Thomas Walling and Mary Abbott:
Continuing Glenn branch of tree from Jeremiah Glenn: