No luck with the 1900/1910/1920,but found them in the 1930 Los Angeles Co.CA. 2507 117 120 Juan Garza 37 m@22 TX TX TX Jessie 24 m@18 Mex TX Mex Mary 14 TX TX Mex Jo(?)(son) 13 TX TX Mex Lorenz(?)(son)11 TX TX Mex Alfonso 8 CA TX Mex Armondo 6 3/12 CA TX Mex
The WW1 Draft card lists John M.Garza b.26/Dec/1892 Lives in ElPaso with wife and 1 child.Works as a clerk for the Santa Fe Rail Road. He served 4 yrs in the Tx.National Guard-Co.A. This card is difficult to read,but looks like he was born Rome,Stanco(?) Tx.If you'd like,I will email this image. Date of registration 6/5/1917.Perhaps you can request his military records. Hope this helps.