Mengden was the son of Walter Mengden, Sr. (1903–1986) and Eugenia Mengden (1905–1983) of Houston. In 1938, the senior Mengdens purchased the Holley-Mengden House at 2240 Glen Haven Boulevard in Houston, now an historic site. There Mengden lived until adulthood.<ref name=hmh>{{cite web|url= http://www.houstontx.gov/planning/AboutPD/news_releases11/HolleyMengden_LogginsHughes.pdf|title=Holley-Mengden House and Loggins-Hughes Building now historic landmarks|date=May 4, 2011|publisher=houstontx.gov|accessdate=September 11, 2011; material no longer on-line}}</ref> In 1950, Mengden received his Bachelor of Business Administration degree from the [[University of Texas at Austin]]. Subsequently, he obtained his [[L. L. B.]] and [[Juris Doctor]]ate from the UT School of Law. He was admitted to the bar in 1954. He was a [[Roman Catholic]].<ref name=senate/> | Mengden was the son of Walter Mengden, Sr. (1903–1986) and Eugenia Mengden (1905–1983) of Houston. In 1938, the senior Mengdens purchased the Holley-Mengden House at 2240 Glen Haven Boulevard in Houston, now an historic site. There Mengden lived until adulthood.<ref name=hmh>{{cite web|url= http://www.houstontx.gov/planning/AboutPD/news_releases11/HolleyMengden_LogginsHughes.pdf|title=Holley-Mengden House and Loggins-Hughes Building now historic landmarks|date=May 4, 2011|publisher=houstontx.gov|accessdate=September 11, 2011; material no longer on-line}}</ref> In 1950, Mengden received his Bachelor of Business Administration degree from the [[University of Texas at Austin]]. Subsequently, he obtained his [[L. L. B.]] and [[Juris Doctor]]ate from the UT School of Law. He was admitted to the bar in 1954. He was a [[Roman Catholic]].<ref name=senate/> |