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Hi Thomas, 

Thank you for the response. I wanted to hear your thoughts on my unique situation below: 

1: My status: H1B visa from 2016, citizen of Nepal.
2. My wife: Citizen of Nepal, lived in the US with me until the Dec 23, 2017. Has SSN.
3. Two kids born in the US: daughter: 7-13-2016.    and son: 9-13-2017
4. Wife and kids lived in Nepal from Dec 25, 2017 to Jan 16, 2020, and returned to the US on Jan 17, 2020.
 
Questions: 
Do I file my tax return as married filing jointly or separately or single or otherwise for the tax years 2018 and 2019?
Can I claim child tax credits or other dependent credits for the given years? 
 
I supported my wife and kids 100% while they were in Nepal. My wife did not earn any money in the tax year. 
 
Thank you again
Baru