the hopeless case of a brother

Mother sent Lauri to the shop today with a shopping list. And my brother came back with the needed stuff and a chocolate for me!!! I mean it was probably cause I let him use my bike but still... looks like he's not the hopeless case of a brother I thought he was. He's just so incredibly cocky and mouthy. You literally cannot have a conversatin with him. He just tells you to shut up, says "I dunno" or "I don't care".