Why does Justin greet the different members of the family in four different ways? from wonder

This is one of the shorter sections, but Justin's segments are extremely important because they give us our first substantial look at Auggie's family from the outside. Summer and Jack only briefly interacted with the rest of Auggie's family, but Justin spends a lot of time getting to know the Pullmans and their family dynamic. Through Justin's point of view, readers get to see how this loving, supportive family appears to onlookers; the Pullmans' close-knit relationship becomes even more significant when Justin reflects on the lack of love and connection in his own family.