My grandson five yrs old, some times talks very much off the line... Like whenever I stop him for doing some thing.. He would say " you also used to do the things same way  as I do and I was there to see all this."..".pleass believe me your mummy used to tell me about you" Some times he says " I am not able to control my mind and hence not able to obey and do the right things. " Mostly never agrees to say sorry.. Defends unlike child... Otherwise he is Absltly normal and healthy goes to school, student - little above average . Is is suffering from some mental or psychological /psychetriac issue