As others have said, the 27 ACT is too low. Are you a legacy? Have others recently been admitted to Yale or Harvard from your high school? Is your school known for its academic rigor? If others have attended Y or H from your school did they successfully matriculate from those colleges? Hopefully, you applied to a range of other schools. Your ECs are very good and taking care of family is a worthy explanation of how one spends one’s time outside of class. Best of luck with your admission decisions.