Okay kiddo, so there is a group called Yes California and they want California to become its own country, separate from the United States. They believe that California would be better off as its own independent nation. Just like how you may want to play with your toys by yourself sometimes instead of with your friends.
But, becoming a separate country is a big decision and it involves a lot of things like creating new laws, figuring out how to run a government and economy, and even creating a new flag and national anthem. It would be like starting a new game with different rules and challenges.
Some people in California may agree with Yes California's idea, but not everyone does. Many people feel proud to be a part of the United States and enjoy the benefits and protections that come with it. It's important to listen to everyone's opinions and then make a decision that is best for everyone. Just like how we listen to your sister's ideas before deciding what game to play next.