You do not provide enough information to give you a complete answer. Generally, if your children are under 21, you should be able to get a legal status for them, as well as for your children. You need to meet with an immigration lawyer to evaluate your income and assets to make sure that you have financial capacity to sponsor all your family members. Otherwises, you may find a co-sponsor.
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You shouldn't try this alone. Use an attorney. How old are the children?
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I agree with Mr. Randolph. Considering what is at stake and how important it is that this be successful, you really need to talk to an attorney and run these issues by him/her. The attorney should help prepare the petitions as well.
As a U.S. citizen you can petition for parent and children. Having said that it is very important you seek professional help before you file the petition and/ or before your relatives plan to leave the U.S.
This response is general in nature and cannot be construed as legal advice, given that not enough facts are known. Any comments offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship. If you would like additional information based on this response, please contact my office at 510 657 7665 or 415 902 0832 to schedule a consultation.