i wish to bring my parents who are 73 and 65 years old to USA by applying green card. Will you please advise me whether there will be problems in bring them with a green card? Also on the other hand if i apply for green card for them by applying I 485 (Adjustment of status) after they arrive in USA, can they be stayed back till their green card is approved or do they have to leave in the time frame say 6 months from the date of their entry into us.Please advise