After talking with the chairman, he walked away with his sister and Camellia. Since other places weren't safe, they decided to stay inside the Council's headquarter. They had also transferred his mom and dad to this place since it was a lot safer.
After that, Peter took care of Anne until she wakes up. They had to transfer blood in her body. After that, he spends another day taking care of her. During this time, Peter regretted killing Morgan before curing his parents.
He knew he messed up but he wasn't frightened. He still had the support from the tower. So long he does everything correctly, he can heal his parents soon. After spending some time with his sister and Camellia, he entered the Tower.
Now, his goal was to get stronger at a faster rate. Currently, Divine Rank was a great threat to humanity. And, it's not like he must save humanity. But, if he can't save his family then everything is simply a waste for him.