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Sometimes with siblings you can have a brief falling out. I did the same with my younger brother for a while. What I did was chat, but when you feel the conversation turning, say poliet something like " ohhh shoot- I have get the clothes in the dryer, take the dog out, start dinner, make breakfast for the dogs or yourself, or get firewood, answer the door- shut the doors.. " .. you get the point. Soon it will start to change, and polietly tells him you dont have time for such nonscense.