EEA family member

[nazmul2010]

My name is Nazmul Hasan and recently(14/12/11) I have received residence permit for 5 years on behalf of my wife as she is an EEA member. Now I like to bring my Mom and my younger sister from Bangladesh in UK for permanently. My father died on 2007 and my sister got married 2010. We had our baby on 14/10/11. My wife receives housing and child benefit and she also gets maternity allowance as she worked less than 26 weeks with her employer. But I am working part time and paying my tax.

My questions are-

1) Can I bring my family from Bangladesh?
2) If yes which application form I have to fill and what is the best way?
3) How much it will cost me to bring both my mom and sister?
4) If they comes here how long they can stay and with which status?

Please help me

Thanks