if your wife is a US citizen, she can sponsor her own daughter as an immediate relative if she is under 21. If the daughter is over 21, then she would fall into a preference category and she would be able to get a visa when her priority date becomes current. So she should start that process now. There is no category for a US citizen to sponsor their granddaughter. As far as the sibling is concerned your US citizen wife can file an I 130 but the wait time is going to be about 15 years before a visa is available.
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