Nice shot, perhaps a bit tighter of a crop and a bit brighter with a touch more contrast would make a big difference. Even something as simple as Image, Auto Contrast (or Auto Color), then edit, fade back about 50%. A lot more could be done here regarding adjusting the skin tones & levels.
Very strong family resemblance. I like the way you emphasized that with the matching colored clothing. I like the focus and DOF and their pleasant natural expressions. The lighting seems unbalanced on the two subjects -- too harsh on him (blown highlight on forehead) and too shaded on her. Also, I wish you had positioned them is such a way that the mother didn't have to crouch to get close to the boy. The posture looks unnatural and uncomfortable.
good composition, pay attention to your white balance setting on your camera. If it were set to a cloudy day, the skin tones would probably be a little more appealing. good depth of field.