hi everyone i just want to ask question about getting my parents. Do I need to be a citizen before i get my parents? and if ever i get my parents and they become citizen what age range of my brothers and sister should be for my parents to petition them? thanks.

Yes

There is no age limitation for sponsoring children, see link for categories:

http://travel.state.gov/visa/frvi/bulletin...letin_3143.html

Thanks Boiler I have a cousin who has just petition his father. Is it true that after his father get his citizenship he can get his 2 unmarried daugther ages 38 and 30 years old? how about the 2 married sons ages 42 and 45 can he still get them? how long the waiting process for the sons and daughters?

If you look on the link you will see the categories.

Gender makes no difference, unmarried seems about 11 years, married about 17 years.

These timelines are looking at past applications but the only thing you have as far as the future is concerned.