Does anyone have a child who is showing difficulty in recognising people by their faces? If so you may want to research a condition called face blindness (medical term prosopagnosia).
This condition has only been researched in the last few years and although it was thought in the past to be extremely rare it's now estimated that it may affect as many as one in fifty of the population.
Many adults who have suffered from it all their lives are only now discovering that it's a neurological condition, not a personality defect.
If you think either you or your child suffers from this (it's often hereditary) have a look at www.faceblind.org.