What to Know About Legacy Admissions

Preferring legacies means that the college is effectively saying that unearned inherited privilege (that is often added to existing advantage) can sometimes override earned merit.

While about 60% of private colleges consider legacy status, some do not.
https://mitadmissions.org/help/faq/legacy/
https://mitadmissions.org/blogs/entry/just-to-be-clear-we-dont-do-legacy/