I am not sure how old your nephew is and what he is drinking. If he is taking drugs or certain medications that can make him nervous or cause hallucinations as side effect or make him feel tired as a side effect then this can make him moody and unhappy. These can cause tantrums. Hence talk to his doctor about his medications.
Also some children are prone to temper tantrums. It is important to work with these children to find ways to distract them, understand when they are likely to throw tantrums and prevent it from escalating through positive reinforcement or through distraction techniques, rewarding good behavior with things that the child was demanding through tantrums etc. Please discuss this with the child’s pediatrician and if need be through a couple of counseling sessions. Take care!
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