Grandson is more important or happy family?

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My uncle really is not happy and too worry to sleep well, so his bad condition is worse. Why he is so worry, because my elder cousin just has a granddaughter(elder cousin just can be have one child due to job's limitation), do not have a grandson, he thinks that is very important question, he even ask my elder divorce and marry with another women to have a grandson. Of course my elder cousin refuse to do. Now the relationship between them is very bad, they do not want to talk each other any more, the family is full of unhappy air, so terrible. The conflict about traditional idea is heard to deal with. I really want my uncle understand, Granddaughter is same important with grandson.