Can a 30 years old schizophrenic person have co-guardians of three persons: dad and two sisters?

Arkansas law does not allow for more than two (2) "co-guardians" of the person or estate of an incompetant adult (AKA the "ward") and only husband...

First, because I'm assuming your friend is not married to the mother. If that is true, he needs to understand that she is the presumed custodian...