I have located and copied the death certificate of Rudolf Able, but unfortunately though it says he was married, the name of his wife is listed as "unknown".
I am not sure exactly what it is you are looking for, and therefore do not know how to proceed. Are you interested in having copies of documents like this, or are you only interested in finding the names of living children? Please let me know so I know what to get you. If you are just interested in names of living relatives I will proceed differently.