Compare and contrast the similarities and differences between Grandma Lynn and Buckley in regards to how they deal with Susie's disappearance or death.

Before Susie goes missing, Grandma Lynn rarely visits the Salmon family, and when she does, she tends to create conflict. Despite her flaws, particularly self-absorption and alcoholism, Grandma Lynn cares deeply for her daughter and grandchildren, which is reflected in the aftermath of Susie's disappearance. When she learns of Abigail's affair, she attempts to make her daughter promise to break it off in order to spare the family from experiencing more pain. After Abigail leaves her husband and children for California, Grandma Lynn moves into Susie's room and does what she can to help care for her grandchildren.
Susie's youngest sibling, Buckley, is four years old when he learns that Susie has died. Grandma Lynn and his father, Jack, help him grasp the concept of death at a young age by telling him that Susie is gone and will never come back. Buckley believes that he sees and talks to Susie, who visits him at night. The reader is never informed whether this is real or merely a product of his imagination in his process to understand her death.
A definitive way in which Buckley and Grandma Lynn are similar is their awareness of Susie's presence after her death, although to different extents. Buckley has visions of his deceased sister, and Susie notes that Grandma Lynn is vaguely aware of her presence at certain times. Susie attributes this to the fact that Grandma Lynn is close to death herself (she ends up dying several years later):

You don't notice the dead leaving when they really choose to leave you. You're not meant to. At most you feel them as a whisper or the wave of a whisper undulating down. I would compare it to a woman in the back of a lecture hall or theater whom no one notices until she slips out. Then only those near the door themselves, like Grandma Lynn, notice; to the rest it is like an unexplained breeze in a closed room.

Moreover, both Buckley and Grandma Lynn undergo character changes as a result of Susie's disappearance and death; Buckley grows up to be withdrawn and introverted due to the loss of his sister (though this is also associated with his mother's abandonment), and Grandma Lynn takes on a motherly role in the Salmon household.