I have great ECs and stats (perfect ACT score), but I’m only ranked 16 (top 3%) at a pretty competitive school in Texas. I know someone who is ranked lower than me and has worse ECs and stats, but is a sibling legacy. I’m worried that he’ll get in over me because he is a legacy to Yale. Should I apply somewhere else for my SCEA instead?
Note: I’m a junior.
One should not use “only” and “top 3%” in the same sentence; it is disingenuous.
Yale, like most universities, does not have a min/max/quota per HS, despite what urban legend/reddit/quora would have you believe. Yale may admit you both, only one, or neither. Their decision, IMO, will not be based on sibling legacy (which if Yale gives any credence, it’s far less than parent legacy anyway). However, they will not admit you if you do not apply.
At a school where one of my kids had a lot of close friends (because he went there for nine years), the year they were all seniors, 11 kids applied to Yale SCEA out of a class of 98. Seven of them were legacies – not sibling legacies (which is relatively weak), but one or both parents had at least one degree from Yale (mostly Yale College, but also MD, PhD, and JD). Anyway, only one kid was accepted early, and she was one of the four non-legacies. Also not an athlete, not a URM (in fact, Asian), and not one of the top two or three kids in the class based on grades. Some of the legacy kids who weren’t accepted at Yale were accepted RD by Harvard, Stanford, Princeton, and Columbia; they were hardly weak candidates.
The point is: Apply on your own merits. You probably won’t get accepted, but the legacy kids you know also probably won’t get accepted, either. If you have a good case to make for yourself, you just may be successful.
Thanks for the advice! I feel encouraged to apply to my dream school now 
According to your Chance Me post, you are not a junior, but instead are a senior who “applied to Northwestern HPME, Brown PLME, UPittsburgh GAP, Baylor2Baylor, Rochester REMS and Boston SMED.” So why the dishonesty and why do you care if a classmate applied to Yale?
http://talk.qa.collegeconfidential.com/discussion/comment/21008769#Comment_21008769
@Indivisible exposed
In most cases sibling, cousin, uncle/aunt are not considered legacy. Typically it’s parents and grandparents. Also undergrad legacy has more weight than professional/grad school legacy.
Closing thread due to discrepancies given by the OP as called out above.