As EU/EEA/EFTA nationals with right of residence in Norway pursuant to the EEA Regulations, your family members are entitled to come to Norway to live with you. There are two different schemes that your family members can use to be granted family immigration permits.
Which scheme they fall under depends on which citizenship your family members hold. If they are also EU/EEA/EFTA nationals, they are covered by the registration system for EEA nationals and will be issued registration certificates. If they are not EU/EEA/EFTA nationals, they must apply for residence cards as family members of an EEA national.