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Sadness, nerves, jealousy, anger and frustration - just like adults, children feel these emotions, but sometimes don't have the words or skills to deal with them.
Gen Muir is a social worker, parent educator, author, founder of Connected Parenting and mum of four boys.
Her latest book is called Little People: Big Feelings.
She says from toddlers to teens and even into the 20s, parents need to work on looking behind the behavior, to figure out what's really going on.