Lost her game soft

My younger brother has lost his older sister's game soft. When he went to his friend's house, he had brought it, and he lost it there. He seemed to be very scolded by his mother. She looked for the game soft with him, but they couldn't find it. She'll buy same one from now on. His older sister probably allow him because she is different him. He never allow such as this. He is very obstinate in strange.