ignore. Why do you care about it?
My relatives too nag me a lot. I just ignore them. When I go home, I talk to them nicely, drink a cup of coffee, and explain them that I am just a pennyless dude in USA. Be modest, be polite, if you can help sometimes, but if you are like me, a regular folk with potential sallary of 60-100K, limit contact with them if they sound like a bit too demanding or envious.
Another thing: DONOT EVER go around telling them how much you earn. May be your folks do that , tell them never to do that. A lot of Nepali invite jealousy by bragging about their earning or earning potential. If you do that, what do you expect others to feel? Afterall, everybody is human, and we all are jealous in our heart. It is only that some people control their feeling, some can't/don't.