Hello there I wanted to ask is it better for my mother a green card holder to file for my siblies underage 21, or should I file for them am a US citizen 22years old and currently in the arm forces

Filing for siblings could take up to 10-12 years for many countries. It's much faster to let your mom do it.

Thanks for your helpful response, but one more question. I wanted to know how long it usually takes if my mother file for my siblies underage 21, from jamaica?