Task: Question Answering
Input (English): Even then he kept a wary eye out in case one of his siblings had randomly decided to have lunch there . Over the last day or two , Ginny's situation had been going around in his head , and it made it all the more important that no one know about this bewildering turn of events yet . Not at least until he and Ang had calmed down enough to discuss their options sensibly . Lists had to be made . 
Question: Why might one of his siblings randomly decide to have lunch there ?
Output (English): Because they're hungry .