i have 3 step children in the Philippines, 2 under 21 how long dose it take to petition them to live in usa with me also how much dose it cost?

I will assume for purposes of your question that you are a US citizen. I will also assume that you married their parent before they turned 18. Otherwise there is no relationship recognizable in immigration law and they would have to be petitioned for by their parent. Under the above conditions, it will take a long time for you to immigrate the child over the age of 21 as the F-1 category for US citizens petitioning for adult unmarried sons and daughters is only available to those who filed immigrant visa petitions by December 15, 2011. If you file I-130 immigrant visa petitions on behalf of the two children who are under the age of 21, they would fall under the category of immediate relatives of a US citizen and should be able to immigrate within approximately one year. However, if you decide not to sponsor them until they reach the age of 21, they would be in the same situation of the first child. If you sponsor them now, but they do not immigrate for years, you and they will have to keep in contact with the National Visa Center to ensure that their cases are not terminated because of future inaction. Present immigration filing fees for form I-130 are $535. We do not quote our fees publicly although they are reasonable. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.