Immigration Site

All:

My uncle just got his green card through family immigration. He has a government job as a professor in a university. He has 7 more years to retire from the government job. How can he maintain the Green card status and still have his job. He can spend about two months in summer and about a month in December every year for next 7 years. He is also not in hurry to get his citizenship.

Please advice.

Thanks.

Why did he bother to get a green card, if his plan is to work for 7 more years in his original country and then retire?

He has two sons. One is finishing 12 grade this year and ready to go college here in US. The second is already in US in undergrad school. My uncle got his GREEN card through family and Im not sure if he had an option to choose his date of immigration to a later date.

Can my uncle stay in US for the summer (about 2-3 months) every year and then finally move after 7 years?

Are there other options to just maintain the GREEN card status in this situation?

Is there any option where he can ask for a later date to immigrate but let his wife and kids immigrate at this time. My uncle got his immigration through his brother. Please let me know if there is an option for his family to immigrate now and he can come on after few years?