Thomas McLean

Thomas McLean was the father of Tristan McLean and the grandfather of Piper McLean.

History
Piper called him Grandpa Tom, and says that he died of lung cancer a few years ago before she left to Camp Half-Blood. He believed in Cherokee myths and animal spirits, and told her father frequently about them. Piper and her father spent one night camping out in front of his house in Oklahoma. That night she and her father discussed Cherokee and Greek legends about the stars.

Thomas McLean was the one who decided to name her Piper, as he said that she would have the greatest voice in the whole family because of her loud screaming as a baby. He had also said that she would learn how to sing the toughest Cherokee songs, like "The Snake Song." He also told Piper's dad stories about how the stars were formed and that the Greek myths were a "bunch of bull" in his opinion.

The Lost Hero
Grandpa Tom appears in some of Piper's flashbacks.