if you have the birth-dates and -places for Erna Karladetz and Josef Braeuer you can write to the discese-archive in Graz - for dates before 1938 you must search at the archives of roman-cath.churches:http://www.graz-seckau.at/dioezesanarchiv/
they have there the duplicates since 1870-1959 about baptism, marriages and deaths
if you don´t have the dates for Gerlinde´s parents you must write to the registry-office in Klein-Semmering to get her birth-certificate with the dates of them on it. civil-records started in Austria nearly 1938. Kleinsemmering and Garrach are since 1950 both are named as the community (Gemeinde)Gutenberg an der Raabklamm:http://bz-weiz.riskommunal.net/system/web/gemeindeinfo.aspx?...
also you can go directly in contact with the parish-church
Gutenberg an der Raabklamm were they have Original-Matriken (churchbook-entries) for:
Tauf-Matriken/baptism, Trauungs-Matriken/marriages, Sterbe-Matriken/deaths ab/since 1870
but the parish-church-office (Pfarramt) has no e-mail-adress only a post-adress:
Kleinsemmering Nr. 46
hope this helps.
a famous person of Kleinsemmering is Frank Stronach who immigrated 1954 to Canada and is owner of Magna Intern. Inc. in Aurora, Ontario:http://en.wikipedia.org/wiki/Frank_Stronachhttp://www.amazon.com/Magna-Cum-Laude-Stronach-Best-Paid/dp/...