new trader .. no, i do not think your parent can bring his/her son (your younger/minor brother) s his/her dependent.  There are several immigration forums in the net.  you can put your question there ..

http://groups.yahoo.com/group/usaimmigrationhelp/?v=1&t=search&ch=web&pub=groups&sec=group&slk=2

http://groups.yahoo.com/group/immigration_info/?v=1&t=search&ch=web&pub=groups&sec=group&slk=1

you may get response from immigration lawyers in these forums ..