Answer:
Freud would say that both brothers appear to be stuck in the "oral stage of personality development".
Explanation:
Oral stage starts after the child's birth and for 1 year a child is in oral stage of development. In this stage the focus point for development is mouth as a child has oral need to eat,suck milk or water from their mouth. And when their oral needs are not met, they are going to start nail biting or thumb sucking etc to fulfill their basic needs.
