Answer: it is most likely to be a quiet, shy and introvert person.
Explanation: In Carl Roger's theory, development of personality depends on three things: 1) Selfsteem, 2) Selfimage and 3) ideal self.
The first is the steem you have of your tools to resolve situations that may be presented; the second is how you see yourself and it depends on how we are perceived by others and the third is how we'd llke to be.
If his mother doesn't have patience with him and only accepts him when he plays quietly, she is teaching him that the best way to be accepted is being that way (quiet and introvert).