I'm a us citizen my mother and 16 yrs old brother lives in Jamaica. how do i go about filing for them and what form would i need?

 If you are a US citizen over 21, you can petition for your mother to come to the United States. You can also petition for your brother. However, his visa would take much longer than the one for your mother. Instead, I would recommend petitioning for your mother and after she enters as a permanent resident, she can petition for your brother to follow. This would be the fastest way for your brother to enter the US.