Yes - you can have more than one person file an immigrant visa petition on your behalf. For your lawful permanent resident mother to file for you, you need to be a minor Child or an Unmarried Son/Daughter.
See the Department of State Visa Bulletin at http://travel.state.gov/visa/bulletin/bulletin_1360.html
Avi Friedman| Attorney at Law | Wolfsdorf Immigration Law Group | 1416 2nd Street | Santa Monica, CA 90401 | (T) 310-570-4088 x249 | (F) 310-570-4080 | firstname.lastname@example.org | www.wolfsdorf.com | Offices in Santa Monica, CA and New York City
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