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Can 3 year olds have psychological issues?

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Im starting to worry about my 3 year old little brother, there has been a few cases in my dads side of the family of depression including me, and im not sure of my moms side but my 3 year old little brother has been expressing some scary things such as; When he gets mad he says "im gonna kill you" He has chased my sister with a knife After being punished he put his hands around his throat acting to strangle He doent sleep much at night

Im scared he could end up worse later on, is this something to be worried about?could he have psychological issues. Im only 16 but see I remember watching cartoons like scooby doo, rugrats, and playing with hotwheels, not watching new somewhat violent cartoons(watch some current day cartoons and think) and playing with toy knives and guns. What can I do to help him?