Yes, in certain cases a single petitioner can be used to allow for multiple beneficiaries. The primary beneficiary can list children or a spouse as a derivative beneficiary. According to USCIS, children and spouses are the only individuals that qualify to accompany the primary beneficiary. If children who are listed as derivative beneficiaries turn 21 while an application is still pending, separate petitions have to be filed. Partnering with an experienced attorney is the best way to anticipate problems that might otherwise cause significant delays.