Can you help whats the foot and meter of this poem and its figure of speech?

The feet are iambic: because the lines are divisible into groups of two syllables with the stress on the second syllable ( though this need not be so in every instance): in the second line "I don't" "don't" receives the stress: nearly all the lines are six syllables: three iambic feet. The meter of the poem is therefore iambic trimeter. (A good deal of Shakespeare is in iambic pentameter, considered the foundation of English poetry.) The figure of speech in the poem cannot be so clearly nailed down: I would say it is irony or paradox (both involving surprise) because the speaker comes to the conclusion that his brother is right not in his answer , which he continues to think wrong, but in ending the quarrel by admitting he was wrong. The admission of error rights the wrong of the quarrel.