wel mr amazing,, actually it depends upon the parents too whether they really want their children to learn nepali culture or not? if they really want than why they didnt did it from the very beginning...being nepali also they didnt even try to teach them nepali as soon as they r born.. last time one of my friend in california told me about one incident.. he works in a convenient store. One day a nepali lady come to her store with two kids and looking at her face face my friend ask her whether she was nepali or not. and as soon and that lady knew that my friend is also nepali she was so surprised and happy too. she was newar community girl who has been living in US from last 10 yrs and her husband is german. the surprising thing is that both of their children can speak german, nepali and newari very well and of course english too.. tats how thwy are brought up.. my friend was shock when that child speaks newari so well at US but that how it is... its all upon the parents how they want to grow up their child.....