Family Based H1B

[Vijaysinha]

My self and my wife are Green Card holders, working in U.S. and 3 years away from getting Citzenship (5 years rule). Our two sons : aged 24 and 26 years, unmarried are working in U.S. on H1 B Visa. I have following two questions:

- Do you know how soon can we apply for taking their sponsorship? Can we apply before getting Citizenship?
- When can they get EAD after applying on family based Visa?

Thanks for your help