Aeolus is only shown briefly, sitting next to Zephyr during the trial. He is shocked when his son speaks up against Sabazios.
Aeolus is described as looking like "a thicker, more blue version of Sabazios."
Given his reaction to Zephyr taking the side of his friends during the trial, he seems to be rather loyal to his tribe and brother. However, not much else is known about him.
While they are not seen interacting directly, Zephyr mentions that Aeolus will try to change Caelus's mind about Sabazios's punishment, showing that he cares about his brother.
"You too, my son?" - to Zephyr, when his son spoke up in the trial
- Aeolus is a wind god of Greek mythology, where he is also the father of a Zephyr(us).