I have searched the Karnes County, TX website and found birth records for the following:
They match the names you list
Garza,Selvia 8-15-1928 F Olmeda Martina Rodolfo Garza GARZA HYLBERTO MARTINA ALAMADA RUDOLPHO GARZA 7 20 1929 m Garza, Oscar 1-24-1931 M Martina Arlemado Rudolph Garza GARZA, EVA ALVEEDA MARTINEZ RUDOLPHA GARZA 07 APR 1932 f
Notice the mispelling of names in some records (probably due to the transcription from the original hand-written records).Also, note the name Hylberto may be a phonetic of Gilberto (spell it like it sounds - I saw many like that).
I could not find a death record for either Rodolfo or Martina - yet.
Do you suppose that Martina died before 1944?I found a 1944 birth record for a child of Rodolfo Garza and M. Gregoria Velas.I was wondering about the possibilty of a second marriage/family for Rodolfo.