Uncle who smoke in front of my brother

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My uncle is living in us and I don't like him because he is very untidy and he also smoke in front of my younger bother who has a asthma and I now that he knows it already about the situation of my bother.. If you are in my situation what will you do to tell your uncle to stop smoking in front of your younger brother who has a asthma?? if your uncle in easily get angry if tell him to stop smoking...