Rekab, relax you should be fine. Most asians including Nepali's look up to White people in general. His parents may be bit surprised but I dont think they will disown their son or anything like that. Unless they already have a Wife lined up for him.

They like the light skin color of white people most of all. As for Food, you dont even have to give up Beef. There are lot of Hindu Nepalis that eat beef. Just dont eat it when you are around conservative hindus and u should be fine.