I am a legal permanent resident for 14 years; I would like to know what I need to do to ask for my brother to become a permanent resident or green card. He’s here in U.S visiting me with his visa. He is 27 years old and not sure if I am eligible to request it.
You cannot petition for brother until you become a US Citizen. And, even after that, it takes over 10 years to get a green card. See family category 4 in the current visa bulletin: http://www.immigration.com/visa-bulletin