This is why first thing when you take the throne, you kill your entire family. Harsh but true.

This is what literally didn't happen to Harald Hairfair. His dad fukken died from falling into a frozen lake that was melted by hot cow poop, and then his uncle came to the farm he was staying at. He was all like "Uh yeah, ur dad died, kiddo, so you're chief now. Yes, I know you're about 10, so I'll be assisting you against all our rivals." and when Harald became an adult (15 yrs old), his uncle was cool about it and stepped aside to be an advisor and general.