Ancestor of the Zhang family?

The three extra guests were naturally the three cubs.
Although the original world inside Katsumi Barlow's body is only a tiny space as big as an adult's head.
Moreover, the three little guys are not experience trees. They are special life forms and cannot be shrunk.
However, even the cub of the Earth Bear was only the size of a kitten. As for the two Gray Wolf King cubs, they were even smaller than mice. They could barely stay in Katsumi Barlow's original world.
As for the blood demon...