While she and Jacob argue a lot , she is proud of his achievements and they care about each other .
Jacob 's oldest sister , who is vain , loud - mouthed , and short - tempered but very smart .
While sister and Jacob argue a lot , sister is proud of Jacob 's achievements and they care about each other .
Jacob 's oldest sister , who is vain , loud - mouthed , and short - tempered but very smart .