All 5 of us applied to U of M. Only one of us got in. Let me repeat that for you. Only one of us got accepted. It wasn't me either, my brother got in because he had the highest grades of all of us with a 3.7 GPA and a 29 on his ACT's. I was only a little behind him 3.6 GPA 26 ACT. Clearly alumni status didn't count that much.
In the University of Michigan undergraduate school suit (Gratz v. Bollinger), 'legacy' applicants were awarded 4 points. Racial minorities were awarded 20 points. Perfect SAT scores were worth 12 points.
The effect of 'legacy' admissions policies on the racial profile of matriculating students is pretty low, and the issue essentially a canard to distract from the serious distortions introduced by "racially sensitive admissions policies."