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母亲中国护照，同时有十年美国和加拿大探亲签证。想在加拿大先呆几个月，再来美国呆几个月。如果只在美加两国之间游走，中间没有回中国，I94 停留时间每次入境美国和加拿大，可以重新开始计算6个月吗，还是后面给的时间有可能会很短呢？
-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，加拿大公民儿子在加拿大，还是美国公民女儿在美国为她申请绿卡，哪边福利比较好，手续方便呢？