J very occasionally pretends to be an alter ego, called Charlie. Charlie is also my son and he is very amenable, quiet and well-behaved and he generally complains about J ("Mummy, J hit me! Mummy, J said a naughty word!") Anyway, he was playing at being Charlie this lunchtime at home - we have a new routine and he now comes home at lunchtime, as he was complaining about the food in the canteen and asking to come back - and pretending that J kept hitting him. I asked him what he could do about it and he offered all the sensible suggestions - tell him to stop, that he wouldn't play with him any more, etc. Then, when J would not stop (in Charlie's imagination), he suggested I send him to his room!! The thing he never accepts himself. Charlie sat on my lap and cuddled me as he told me, with satisfaction, that naughty J had gone upstairs and was leaving us alone. Anyway, I find this alter ego interesting - the fact that J as Charlie recognises the undesirable behaviour as undesirable and himself wants to sanction it. What, if anything, does it mean?? Have anyone else's children had this kind of "other personality"?