Give your son a complete break from potty training for at least two weeks. Don't mention one word about potties or anything to do with using the toilet in this time. Let your son wear trainer pants. After the 2 week period is up start again, praising any success as much as possible. Do not criticise him if he fails to use the toilet at times. Offer him rewards if he is successful in using the toilet. Have lots of patience with him. I don't think that the death of his baby brother is the cause of this particular problem.
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