If your husband is not the biological father of the children, he will have to file I-130's for them. Immediate Relative Petitions, like those for a spouse, do not offer derivative benefits. He has to file individual petitions for each of them. If they were his biological children, he can attempt to register their birth at the local embassy, where they might be able to then get passports (because they would already be citizens).
he has to file individual petitions for each child. they do not get derivative immigration benefits from your immigration. this should have been started when he first petitioned for you. call rosemary esparza in the california area. a great attorney.