He watched as the doors opened, he watched as they walked forward and he watched as they each showed reverence in their own way. Whether that was done because they thought it was expected of them or because they honestly felt it was earned -that Zeus was in his rightful place, remained to be seen. He was pleased with the kneeling, the curtsey and of the two of them that spoke, their proper honorifics. Either they feared him or Styx had raised them well.
Zeus chose to answer Zelos, at least he thought it was Zelos, and said, “I did.” Immediately after that statement, the rapping of his fingers on the arm of his throne ceased and a thoughtful look crossed his face. He wasn't angry, there was no need in appearing so.
“I don't know how much your mother has told you of our arrangement but she will be remaining in the Underworld while you four shall remain here.” There was much not even Styx had told him of her reasoning as to why she would send her children to live on Olympus.
“You can all stand up,” he said a moment later and stood himself. This wasn't a sit still and dictate sort of conversation. This was a conversation that would help sort matters out. Give some order and balance to what was already out of whack. Pacing before them, he continued, “I expect a certain order of things. I like to know when people are happy, when they are unhappy. It seems to me,” he paused a bit in front of Kratos, “that perhaps you are all unsure of your place here now. Uncertainty doesn't give way to order.
“I asked you four here so that we may discuss your duties and responsibilities here now that the war is over. I want you to speak freely. Where do your interest lay?”