What would be the best thing to do regarding the interview?

Please I need your advice. My English is 50/50 but I try my best to till the story I’m here in the united state since 2002. I come with my husband and 2 children (2 & 5 years old at that time) .My family here (mother and 3 brother) all of them US citizen. When we come here, we have a visa 5 year I think its visitor visa .My old brother file a I 130 for us in (April/19/2001). My I 130 approved since that time, last month my priority date current and the visa number available. my lawyer send to uscis Chicago lockbox all form for me and my family (I 485, I 765, I 131) with many paper and documents. We all do the biometric last week, and now we are in the testing and review stage(uscis case status) for the I 485 form, everything is ok until now. We receive interview appt (May 20, 2013) I'm concerned about the work history , my lawyer when he fill all form he eave it blank and answer NO for the question: are u ever work in the united state? My 3 brother support me and my family since I come here in 2001 and they bay for my rent and also my mom give me a monthly salary. I have a nice and good family all time they take care of me and my husband and my kids. When we send the back age for uscis also we send affidavit of support from all my 3 brother for each one (me and the kids and husband). Everyone have a 3 affidavit of support coz my old brother (the petitioner) don’t make more than 20.000 last year that’s why my lawyer send a three affidavit of support to uscis. I’m think now about my interview. I don’t want to lie if they ask me are you ever work or your husband? Honestly, I never work but my husband work sometimes just to feed our kids and me. As I say I don’t like to lie but my lawyer already put in the application that we never work. We don’t have SSN by the way .Please I need your advise what I gave to said if they ask me about this in my interview? I DO NOT WANT TO LYING at my interview. Thank you.