Line 17-Part C: this is your relative (your spouse). So you will put your name as husband and your son as son. For your son, you will list you as father and your wife as mom.

Line 20- answer is same as my previous one. Either write with black pen the full name and addrrss of your wife in Nepalese or copy and paste from some english to nepali converter website.

Line 22- put N/A in all four box. Don't put Pokhara, Nepal. It is not applicable in your case. Only fill this if she is actually here in US and is not eligible for adjustment of status and have to go back to Nepal for further processing.

I hope this helps. I am not a lawyer but have completed these forms for a lot of friends and family.