The Change in Cat Behaviour

Her grief might not look like sadness, but her behaviour has changed. She's behaving like a cat who's starving and there's plenty of food. I think she's asking me for her brother. Because their boy kinda wild. It wouldn't be mad for one of them to disappear for a day or two that's happened before. But now she's noticing her empty bed. These were adult cats. She could be ten years old. She's definitely five or six. She has known nothing other than the company of her brother for her entire life. He would do something that would piss her off and then she'd kick the head off him because she had to do so much of the work