parents got green card last year --- do they need to file tax re

I applied green card for them and they got it in May,  they stayed here up to Sep and went back China.   Do they need to file tax return to the US?   I know there are new laws,  they just have a regular retirement income in China and no income in the US. 

Thanks!

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• Claim them as your dependent and get tax benifit for you (deduct -nova01- ♀ (0 bytes) () 03/22/2012 postreply 13:01:55