Yes, Lural Dement is from this same line of Dements, and was Dennie Marie Schmidt's uncle (brother to Dennis Dement). I remember that Dennis collected and restored antique cars, and Lural's son, Gilbert Dement has a brake and clutch business here in Austin.
Regarding your great-grandmother Emilie, I have only kept up with the descendants of my great-grandparents Edward Harvey Dement and Mary Ann English, and I believe there are some German names affiliated with a couple of Edward Harvey's brothers' families, also here in Texas (Lural Alexander Dement & Hannah Derrick and Charles Gilbert Dement & Missouri Derrick) though I haven't kept up with their families over the years.
The line for these three brothers and a few sisters is Charles Dement & Selah Thomas (Cader's parents), Charles Gilbert Dement & Frances Harris, down to their parents, Ruben Dement & Synie Glenn.
A couple of cousins and myself keep up a website for our branch of the Dement family at http://www.dementtree.comhttp://www.dementtree.com