It will a lot longer than 5 years to get your green card through your father.  You are in category 2B and there is currently an 8 year wait for your category. 

See the visa bulletin at http://travel.state.gov/visa/frvi/bulletin/bulletin_4371.html .  The wait time for a brother is currently 11 years.  Neither will get you in-state-tuition before you graduate.  I advise you to have both your father and your brother file petitions. 

Getting married can hinder your petition filed by your father. So it is good to have a back up. (Also if a parent petitions for her child but dies before the visa is available, then that petition is void.)