Welcome to the JAMFAM Npepper! Sammy and Lala are right, you need to ensure that you are filing correctly otherwise it will just cost you time, money and a ton of frustration. If you haven't been living with him continually you will not be able to successfully file conjugal or common law. As for the kids you should include them all with passports and medicals even if they are not accompanying him. In the future if he ever (or they ever) wants them to come they will not be considered. When I filed for my husband we didn't have his child's passport so we filed and I wrote a letter to include with the package saying that he is a non-accompanying minor and his passport and medical will follow at a later date. We sent it in about 3 months later with an explanation. When I received my notes I saw a note saying that "child is non accompanying but his passport and medical will follow as per the sponsor's letter of explanation". Then later notes I got showed that his medical and information was received and they assigned his son a UCI as well.
Good luck and keep us posted.