were they jewish or roman.cath.? do you have more details?
gravesearch Vienna has 8 results, maybe one of them family?http://www.friedhoefewien.at/grabsuche_de?submitHidden=true&...
also 8 results at jewish cemetery database:http://friedhof.ikg-wien.at/search.asp?lang=en
there would also be historical registry dates for 1904-1975 at Vienna City Archive, but for that you need a name, birthdate of sure for one of the persons, for best head of the household. this research can often give some interesting info and often can help for a further reserach as shows then adresses also and you know then which district to search, example for roman.cath. to find the church for files.