This is a nice, well-rounded book with great characters. I particularly like the characterization of the boy, he is very realistic for a child who had grown up as a street urchin, raised by an ill single mother living in poverty. He has trust issues and attachment issues and at times behaves in way that could be very dangerous to everyone around him, including himself. I feel that the way the MCs handle him is a little too modern, such as making a written agreement, but otherwise they handle him very well considering how troubled he is. I especially like how becoming a family does not immediately solve all his problems.
The villain of the piece is a bit one dimensional, but otherwise not too bad. The conflict with him is handled well, diplomatically but with spine on the part of the MCs.