Philip Hamilton #1 was the oldest Hamilton sibling. While his mother was teaching him piano, Alexander taught his oldest daughter, Angelica Hamilton, how to play piano. The two siblings were very close.

After Philip Hamilton was killed in a duel, Angelica Hamilton was diagnosed as "insane."

And while in "Take A Break," Philip mentions that he wants a little brother. At that time, Philip was nine, and he had a younger brother--Alexander Hamilton II--and would soon have another younger brother.