What does the burial of Charles' father's bone symbolize in the novel, The Wangs Vs The World?

The bone Charles carries that once belonged to his father serves as a reminder of how he failed as a son. He did not return to Taiwan when his father summoned him, and so he was not there to see his father before he died or to give him a proper burial. His father was cremated before Charles arrived, and he carries the bone as a reminder of all he has left to do to restore the Wang's fortunes. He buries the bone, finally, in his ancestral land, signaling in many ways the end of his obsession with the myth of his family's past.