This question has many variables as how to answer. The child has many opportunities to learn and grow despite not living with his mom, providing that his environment is rich with love, proper nourishment, a genuine, strong connection with his provider. A child is not bad without his mother. A child will misbehave and adopt bad habits when there is no supervision and direction/routine for the child. I don't like to label a child 'bad' or 'worst', it is generally not the fault of the child, but of his environment and what the child is exposed to day after day. If you have specific concerns, I would be happy to answer these concerns.