I think the poem is mainly a reflective tone as is evident by the first person narration, 'my gentle father kept pace with the Joneses'-however, this is the overall tone, depending on which parts of the poem you are referring to, there are other different tones, i.e. when it refers to the clerk, 'did you father ever attempt to learn English?'-obviously the tone is a lot harsher and clinical and insensitive, and when Skrzynecki describes the physical evidence of his father's hard labour, 'fingers with cracks, like the sods he broke'- there is an admiring tone of his stamina and his hard working nature, and when he describes his father 'watching the stars and street lights come on, happy as I have never been'-there is a tone of contentment for the father, but you also see that there is obviously a tone of alienation and detachment, 'watching me pegging my tents, further and further south of Hadrian's wall'- but regardless of the tone you choose to use-make sure you can back it up with appropriate quotes and more importantly, elicit a specific effect relating to belonging/to your question-hope this helps-anymore questions, welcome to pm me