Legacy does matter at some law schools. Last I heard, it doesn't at Harvard. The form doesn't even ask--which annoys some alums. Last I knew--I haven't looked at the forms in about 4 years-both Yale and Stanford DO ask. I believe NYU does as well. If you are familiar with Yale's system, you get +1 for being the child of a Yale LAW alum--the same you get for being a URM
BTW, if you are a soph, remember that GPAs usually go up. You're in pretty good shape for HLS.