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母親中國護照，同時有十年美國和加拿大探親簽證。想在加拿大先呆幾個月，再來美國呆幾個月。如果隻在美加兩國之間遊走，中間沒有回中國，I94 停留時間每次入境美國和加拿大，可以重新開始計算6個月嗎，還是後麵給的時間有可能會很短呢？
-If she goes back and forth too often, the I-94 may only a few days. Normally if she stays in US for 6 months or more and then leave, she had better stays outside US for at least one year, then enters US again. Thus, she can get another 6-month I-94.

另外，加拿大公民兒子在加拿大，還是美國公民女兒在美國為她申請綠卡，哪邊福利比較好，手續方便呢？