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父母有綠卡。去年十一月初回中國，原定今年四月回美，後因事情延期到六月初。結果前幾天飛來美國的圖中，父親胃部大出血， 飛機迫降日本送醫。 兩天後情況穩定。現在商量先回中國做具體檢查。

請問這種情況下，需要辦理什麽手續，申請什麽延期或者返美證嗎？

--If they come back to US before their stay in China reaches one year (i.e. come back before November), they just need to bring the doctor's/hosiptal diagosis and treatment evidence (e.g. hospitla bills) with them, in case the IO at the port of entry askes them some questions.

If they cannot return before November, then their green card will be void. But your father can apply for SB-1 visa to return to US to reinstate his green card. By the way, SB-1 visa applicaiton is somewhat complicate and it takes a longer time.

Your mother has to return to US before November, othertwise you have to sponsor ger green card application overall again in this case.