This likely will not help you at all. Unless you are the CHILD of a prominent figure at an Ivy League school, just knowing someone there isn’t any sort of hook.
You don’t even know what you want to study, yet you are planning a PhD in it? Please slow down. You are not doing yourself any favors by this sort of disorganized planning. And this is not your fault nor is it a bad thing - you are a high school freshman! You do not need to have all the answers, you do not need to know what you want to study. That is fine and normal! But, for that same reason, there is no reason to jump ahead and plan a PhD at Harvard when you don’t know in what or for what purpose (and doing a PhD can be brutal at any university - you need to LOVE your subject, which you obviously can’t predict now, since you don’t even have a subject).
Slow down, take a deep breath, be a kid, hang out with friends, work hard in your classes, find things you love, and make high school memories. Once you have, then you can think about what colleges might be a good fit for you and your interests. It may be an Ivy or it may not be, and that’s fine, too. But you don’t need to have it figured out right now.