anroid... I understand what you are trying to say. I second that this is an issue for 1st generation Nepalese since language is key to understand the sentiments of a culture. However, with early involvement in Nepalese society, for example, going to Nepali cultural party, involving in Dashain Tihar party, or visiting Nepal often can mitigate your problem. This requires guidance from parents in much part because parents are the role model. If they see their mummi or grand parents doing Laxmi puja from an early age, it creates an impression in their mind. Early childhood impressions are very powerful. Teaching them Nepali language from an early age at home can remedy your problem to a certain degree. Your spouse should also have liking towards Nepali culture and traditions and willing to learn new things. Women highly influenced their kids. This is a complex socio-economic-political situation where a balance has to be created; otherwise, you may not get what you desired. My humble recommendation is: Don't overthink this whole situation. Try your best to be a role model - Action speaks louder than words. And most importantly, try to be content with whatever time reveals to you. As lord Krishna in Bhagavad Geeta said: कर्मण्येवाधिकारस्ते मा फलेषु कदाचन। You do your karma, don't worry about fruits or the results of your action.
Contentment with what you have or what you don't have is the supreme goal to be to be happy. There are many traditions out there, don't get too attached with one particular tradition: Attachment leads to sorrow. Live here playfully.