Did he end up getting in at Princeton after being wait listed? My advice in applying would be to include some of the lower ranked Ivys as well as some of the top ones. Kudos for at least being wait listed at Princeton (I went to Cornell, and, as the great Cornellian song states, we didn’t get into Harvard)
https://www.google.ca/search?q=we+didn%27t+go+to+harvard+cayuga%27s+waiters&rlz=1C1GGRV_enCA775CA775&oq=we+didn%3Bt+go+to+h&aqs=chrome.4.69i57j0l5.12968j0j4&sourceid=chrome&ie=UTF-8
He didn’t respond to them, so I suspect they dropped him. This was 15 years ago. He did get into the Military Academy of his choice. Actually his first choice anyway.