Yes. When you have claimed the Knowledge Panel, Google recognises you as the official representative of the person or brand. That means nobody else can claim it. It also means that changes you suggest (use the feedback button underneath) are prioritised. This feedback is sent to a human being at Google to check and implement if they feel the changes are necessary and positive. Although anybody can suggest changes to information in a Knowledge Panel, when you have claimed yours, your request is bumped to the front of the queue.