What does Miles learn from Alaska's father at her funeral in "six days after"? What does Miles do after Alaska's father leaves?

When Miles asks why the casket is closed, Alaska's father says it's because after her mother's open casket funeral, Alaska insisted that she not be seen in hers. After Alaska's father leaves, Miles then goes to kneel by the casket, Chip standing with him and apologizing, saying he knows Miles loved her.