dependent attend university outside US while 485 is pending

My child started a four-year undergraduate study at a university in Canada this fall. He only come home (at US) during school breaks.  Current priority date is a few months behind  our PD, would it affect his green card application, any documentation that we need submit ? thanks  

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• additional notes[ -ZhangSan1234- ♀ (0 bytes) () 12/08/2014 postreply 13:37:39

• additional note: he has valid AP/EAD card -ZhangSan1234- ♀ (0 bytes) () 12/08/2014 postreply 13:38:07

• Reply -863211- ♂ (571 bytes) () 12/08/2014 postreply 14:08:18

• Thanks so much for answering all my questions -ZhangSan1234- ♀ (0 bytes) () 12/08/2014 postreply 14:27:01