The son could only talk to his father in the sister's absence? Despite the ostensible 'answer' given at the end that God exists in the form of love, the film is full of ambiguities, as all the characters' reliability remain in question till the end.
gilbert:i dont know what to say. arnie:say thk u, gilbert, say thk u.arnie: goodbye. becky:no, it's not goodbye. arnie:it's good night. good night to u but not me.arnie果真傻得让人稀罕