My younger 2yr old is US passport holder and my elder son 10 yr is India passport holder, not vaccinated.
in this case when we enter US will we require NIE? his H4 is already stamped without NIE, how do i get it?
No need for NIE for immediate family of US citizen/ Just carry the copy of birth certificate and US passport of your US born kid.
https://in.usembassy.gov/visas/national-interest-exception-frequently-asked-questions/