Why does bobby have to tell Alicia's parents about his condition in the book things not seen?

Bobby has to tell Alicia's parents about his condition in the book "Things Not Seen" because they are Alicia's caregivers, and his safety and well-being are their responsibility. By informing them about his invisibility, Bobby is being upfront and seeking their help in understanding and managing his unique predicament. It also helps to build trust and open communication between them.