gender

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Hi everybody I have a question. Does any body now how the system of making boy or girl works? My sister has two girls she wants a boy now. I know there is chinese calander that tells you when you should try for boy or girl.Some people even talk about full moon. Anybody know about these things, please tell me. I myself have two girls and do not want anymore. We never thought about having a boy.We wanted two kids , got two. But everybody has different mentality. I want to help her out. Anybody ? Thanks in advance.