Corazon was like a dad figure to Law. His own father and family died. When Law got an 'incurable' disease? Corazon took him to all sorts of different doctors to cure him. Which led to Law eating a devil fruit.

Now Corazon, who somehow survived almost being killed by his brother, was part of the Heart Pirates with Law.

It was late at night when Law came into his room.

"Uh, Cora-san? I... can't sleep." He looked away.