Your husband unfortunately cannot sponsor your siblings. You will first have to become a US citizen and then apply for them. Based on current processing times, the application process will take at least 12 to 15 years, so hopefully they have other ways (such as work-based visa) of coming to the US.
Edward Weiner
Attorney at Law
E-mail: E.Weiner@immigration-aux-usa.com
Internet Site:
http://www.immigration-aux-usa.com/