What is Challenge to his authority and legitimacy?

A challenge to his authority and legitimacy is when someone questions whether he has the right to be in charge or make decisions.

Imagine your dad is the boss of a toy store. He decides which toys get displayed on the best shelf, who gets to try new games first, and even what time you have to go to bed. That’s his authority, it means he’s in charge. His legitimacy is like why everyone believes he should be in charge. Maybe he was the one who started the store, or he's really good at picking cool toys.

Now, suppose your brother comes in and says, "I think I should be the boss!" He thinks he knows better about toys, and he wants people to listen to him instead of Dad. That’s a challenge to his authority, he’s saying someone else could do the job better. If other kids start agreeing with your brother, that also challenges Dad's legitimacy, because now they don’t believe Dad is the best boss anymore.

It's like when you try to be the leader in a game, and someone else says they should lead instead, it’s all about who gets to make the rules!