How to save list of nested two separate objects

How to write model class and establish relation between classes. To save and update the below the JSON using spring boot.

inputJSON

 {
  "modelName": "",
  "modelDescription": "",
  "recordStatus": true,
  "details": [
    {
      "tMemberDetail": {
        "param1": "",
        "pn": {
          "param1": "",
          "param2": ""
        },
        "an": {
          "param1": "",
          "param2": ""
        },
        "p": {
          "h": {
            "param1": "",
            "param2": ""
          },
          "v": {
            "param1": "",
            "param2": ""
          },
          "r": {
            "param1": "",
            "param2": ""
          }
        },
        "t": {
          "param1": ""
        }
      },
      "mattributes": {
        "param1": "",
        "SP": {
          "param1": "",
          "param2": ""
        },
        "EP": {
          "param1": "",
          "param2": ""
        },
        "F": {
          "Required": false,
          "FT": "",
          "G": {
            "param1": ""
          },
          "FP": {
            "param1": "",
            "param2": ""
          },
          "Pmr": {
            "Required": false,
            "Details": {
              "param1": "",
              "param2": ""
            }
          },
          "Pnt": {
            "Required": false,
            "Details": {
              "param1": "",
              "param2": ""
            }
          },
          "ASS": {
            "Required": false,
            "Details": {
              "param1": ""
            }
          },
          "NPA": {
            "Required": false,
            "Details": {
              "param1": "",
              "param2": ""
            }
          }
        },
        "Start": {
          "param1": "",
          "Loads": {
            "param1": ""
          }
        },
        "End": {
          "param1": "",
          "Loads": {
            "param1": ""
          }
        }
      }
    }
  ]
}

I have tried to achieve by writing model class like below

@Setter
@Getter
@ToString
@Entity
@NoArgsConstructor
public class Model extends BaseEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long modelId;
    private String modelName;
    private String modelDescription;
    private RecordStatus recordStatus=RecordStatus.ACTIVE;  
}

@Setter
@Getter
@Entity
@NoArgsConstructor
public class TModel extends Model implements Serializable{
    private static final long serialVersionUID = 7331603514610649855L;

    @OneToMany(cascade = CascadeType.ALL , orphanRemoval = true)
    private List<TMember > tMembers ;

}

@Setter
@Getter
@ToString
@Entity
@NoArgsConstructor
public class TMember implements Serializable{
    private static final long serialVersionUID = 7331603514610649855L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long tMemberId;

    @OneToOne(cascade = CascadeType.ALL , orphanRemoval = true)
    private TMemberDetail tMemberDetail;

    @OneToOne(cascade = CascadeType.ALL , orphanRemoval = true)
    private MemberAttribute memberAttributes;

}

The problem I am facing here is that every time I update call child objects, auto incremental id's are incremented by 1.

If I call get service from another application I get only modelName, modelDescription, recordStatus but not the entire data.