The two correct answers that can be supported based on the poet's decision to describe how each of his family members views the war are:
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The poet is mocking the glorification of war as noble and necessary - The various perspectives of family members, especially the trivial or misguided contributions they make towards the war effort, suggest a satirical take on the romanticized notions of warfare.
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The poet is showing the contrast between the perception of war and its reality - The juxtaposition of how family members perceive the war (with notions of duty, honor, and contribution) against the poet's somber reality of lying in the mud highlights the disconnect between the glorified view of war and its grim actualities.
These interpretations illustrate the poet's critical stance towards prevailing attitudes about war and its consequences.