I believe you are referring to the "big three". Percy is the child of one of the "big three", namely, Poseidon. This knowledge makes Percy feel special, as he shares some of his father's traits.
You did not provide the excerpt, however, personification is when you give human attributes or human behavior to an inanimate object. Using that logic, you can figure out based on the excerpt.
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The guy was suffering in life but he still had love and care for his
sister to say happy birthday. It shows how mental health is not affected
by how you live your life. It's not affected by a lavish life but
rather its what your mind thinks is what your mental health leads to.
YOU'RE SO WELCOME
I LOVE YOU
<3
IM CREEPY
BUT IM SMART
HEHEHEHEH
