Haines’s presence in Stephen’s home clearly represents British colonialism in Ireland, and Buck’s nicknames for Stephen allude to his literary aspirations. Stephen’s mother’s death is absolutely central to understanding him as a character. Stephen gave up on religion in
A Portrait of the Artist as a Young Man (Joyce’s previous novel, which narrates Stephen’s upbringing). Because he did not believe in God, he did not want to pray for his dying mother, even though she wanted him to. Now, a year later, he views this decision as a mistake and intensely regrets it. But he also knows that he can neither bring his mother back to life nor go back into the past and pray for her. He constantly imagines doing so, but he knows that this will only ever be a fantasy. Of course, this is also a commentary on the relationship between reality and literature, which can break reality’s rules but never fully correct its flaws. This is also the main connection between Stephen and Hamlet, who faces a similar kind of struggle against fate and meets his dead father as a ghost.