Is it compossary 4 a man to marry many wives like his father did?

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A friend of mine told me that his father got married to 9 wives and his is going to marry at least 7 wives which i think, to me it's bad.whn he told me i thought he was jokeing but right nw he has 2 wives and he is still planing to have more 5 to complete 7 pls someone should tell me how to talk to him.