You cannot petition for them as green card holders. They can apply for tourist visas on their own if they can prove that they have no immigrant intent and have significant ties to their home country.
They can come on a B2 visitors visa, which is issued at the U.S. Consulate of their home country. The purpose of travel on a B2 visa is tourism, pleasure or to visit relatives in the U.S. They must complete an online non-immigrant visa application first: DS-160, pay the fees and go to their interview with supporting evidence of their non-immigrant intent and travel purpose.
To visit the United States, your mother and nephews can apply for a visitor visa (B-2) at the U.S. consulate nearest to their home and present evidence of why they are visiting the U.S. as well as proof of their intent to return home after the trip. The instructions can be found on the consulate's website at www.usembassy.gov.
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