text: If you know the father's first name, start with that. Otherwise you can check the Indian diplomatic register, or the Norwegian Foreign Office list of its diplomats, for 1974.\n\nThen you need to track him down (or if deceased, try to find his obituary) unless Mona never married and changed her name. \n\nHere are links to the Norway telephone directories: http://www.numberway.com/phone-numbers/9/ Rostard isn't a Norwegian name AFAIK, but Rostad is, and there are 4 listings for Mona Rostads: http://www.kvasir.no/telefonkatalog/searchresult.html?q=rostad%2C+mona&x=59&y=17\n\nBeyond that, it's ordinary skip tracing. Google, Norwegian newspaper archives, credit bureau check, and so on.