I think it would be easier to tell them in person next time you visit Nepal than it would be tell them over the phone, when you cannot see their facial reactions and cannot adjust the rate of telling them based on how they are reacting... Another thought... is there any chance your fiance might be traveling to South Asia soon? Get him to casually visit your parents bringing mail from you (so they get a first sense of there being a connection between you two, and they won't be as suprised...) The key thing is for your parents to come to the understanding that this is the special person you have chosen (for good reason), and to see him for who he is, without first creating a picture of him based on their stereotypes (whether of a foreigner, or a Pakistani or whatever). I guess you will have to accept that they won't be happy at the start, but most parents come to accept it over time when their parents marry someone who does not meet THEIR imagination of what an ideal son in law should be like...