Ok. Well then.
As far as which school you need to go to, you should ask your shver for advice on what he thinks are good schools. If he says you should aim for Columbia NYU, then you are in a much different position than if he tells you to aim for CUNY, NYLS.
As far as how well you will do in law school, you will probably be around the middle of the class. But there is a 25% chance you will be in the bottom quarter, and a 10% chance you will be in the bottom 10%. I am not aware of any method of accurately predicting this. LSAT score is the best predictor, but is not really excellent.
But, I can give you more advice than that. I just need you to answer a few q’s:
About how many attorneys are in your FIL’s firm (give me rough number: 10-20? 50-100? 500-1000?)?
What are the most common 2 or 3 schools that they attorneys went to (look on their website, on each attorney’s bio)?
What is the starting salary for new attorneys there? (give me a range)