Exactly how much of an advantage does being a legacy give you? I'm sure it differs from school to school, but on a whole--maybe more so at the t14 schools--does it really make a big difference? I am a legacy at a t14 school, and am wondering what that will actually do for me.
Probably not much. Law School admissions are far more numbers-driven (and therefore at least arguably more meritocratic) than college, where legacy can sometimes play a big role. There's a lot more pressure on law schools to produce quality professionals, so they're not going to take a dumb kid just because his dad went there.
It may act as a slight tipping factor, such that if your numbers are at the median in both categories, it may help ensure admission. I would doubt it would do much for for you unless your parent was also a major donor, or otherwise connected with the school administration. The slots are simply too competitive these days for allow much else, especially at the T14.