What I would do in this situation; Get a small spy camera (like one of those pen ones), Hide it, record what is happening, then show it to my Guardian. In any other situation, I would allow this to happen (Would love a challenge trying to avoid them) but after reading what happened to her brother, I would not want her to be friends with someone like sofia.

Author's Response:

The challenge would be getting hold of the camera without leaving the house. Remember, he could shrink at any point, can he risk a trip to the mall or a delivery of recording equipment arriving while Sofia is in?