Derivative beneficiary - wife and kids

[Labi David]

I wish to ask if i can include my wife & children age 4 & 2 years in my immigrant visa application form . They were not originally in the petition as i had not got married and given birth to them when my sister filed for me about 12 years ago. I have my case number from the National Visa center now and my petitioner has paid for the Affidavit of Support .Can i go ahead to pay the Immigrant Visa fees for the four of us. Also, will this mean that i have to start all over again since my status has changed hence delay in waiting period and only God knows. It took me 12 years before i could get to my turn. I am afraid i won't have to start all over again.

Please kindly advise.

Thank you