thatbags...well said.
I heartily disagree. I have always been of the opinion that having favourites is a sign of something amiss in a family.....I know this from experience, my father did favourites and it was always the one of us who showed the most compliance.
If you truly love your children the concept of favourites is inconsistent. Love is just love....it does not vary. (Did not a famous playwright say something similar but much better)
I can however, understand not liking a child for a time...it might only be for a brief period, after they have shown a sign of their character you do not like, but deep down you still love them.