交485時孩子到21 歲了，無法跟我們一起申請綠卡了。
1）現在孩子要去加拿大讀碩士，我（綠卡付申請人）想到加拿大照顧孩子。是否有什麽合法的方式離開美國比較長的時間，同時保留綠卡身份？
-You need to apply for reentry permit (RP) to stay in Canada, which allows you stay in Canada for > one year < two years. You can come back to US to re-apply for it before the old RP expires. You can leave US after you conduct the fingerprinting, not need to wait for the RP approval.
2）小孩碩士畢業自己申請485是否會比父母給申請快一些？小孩是加拿大出生，加籍
-You do both ways.
謝謝
