Object Mapper class use to store data in Core Data

Let start from background of my problem.

I have a Person class which is used to parse JSON response

class Person: NSObject, Mappable {

        var ID : String?
        var firstName : String?
        var lastName : String?

        convenience required init?(map: Map) {
                self.init()

            }

            func mapping(map: Map) {
                patientsCount <- map["patientsCount"]
                status <- map["status"]
                message <- map["Message"]
                patientSearchArray <- map["patientsList_JSON"]
            }
    }

While on the other I have another class names PersonMO which is used to save record in CoreData

        @objc(Event)
        class PersonMO: NSManagedObject {

        @NSManaged var ID : String?
        @NSManaged var firstName : String?
        @NSManaged var lastName : String?

    }

Now comes to main point. The problem I am facing is that I have to create two different classes for one purpose. Just like When JSON comes form Server Side then I have to parse it into Person class and then I want to save that Person into Core Data for that I have to convert Person class object to PersonMO class object. Which seems like a bad practice. Is there any way to use just one Class Person will be used to parse JSON and at the same time I want to use that Person class to store data in Core Data.