SQL> SELECT 
  2  table_name, constraint_name,
  3         r_constraint_name
  4    FROM user_constraints
  5   WHERE
  6  Table_Name in ('D_CUSTOMER','D_CUST_AUTH_PERSON','D_CUST_AUTH_CARD','',Upper('d_cust_auth_card_
dup'))     
  7 /

TABLE_NAME                     CONSTRAINT_NAME                R_CONSTRAINT_NAME
------------------------------ ------------------------------ ------------------------------
D_CUSTOMER                     KDE_PK
D_CUST_AUTH_CARD               KKE_EBR_FK                     EBR_PK
D_CUST_AUTH_CARD               KKE_PK
D_CUST_AUTH_CARD_DUP           CHILD_FK                       KKE_PK
D_CUST_AUTH_PERSON             EBR_PK
D_CUST_AUTH_PERSON             EBR_KDE_FK_1                   KDE_PK

6 rows selected.

SQL> 









SQL> SELECT LEVEL, 
  2  table_name, constraint_name,
  3         r_constraint_name
  4                ,SYS_CONNECT_BY_PATH (table_name, '/') PATH 
  5    FROM user_constraints
  6   WHERE
  7  Table_Name in ('D_CUSTOMER','D_CUST_AUTH_PERSON','D_CUST_AUTH_CARD','',Upper('d_cust_auth_card_
dup'))
  8            Connect By prior constraint_name = r_constraint_name
  9  /

     LEVEL TABLE_NAME                     CONSTRAINT_NAME                R_CONSTRAINT_NAME              PATH
---------- ------------------------------ ------------------------------ ---------------------------
         1 D_CUST_AUTH_CARD               KKE_EBR_FK                     EBR_PK                         /D_CUST_AUTH_CARD
         1 D_CUST_AUTH_PERSON             EBR_KDE_FK_1                   KDE_PK                         /D_CUST_AUTH_PERSON
         1 D_CUST_AUTH_CARD_DUP           CHILD_FK                       KKE_PK                         /D_CUST_AUTH_CARD_DUP
         1 D_CUST_AUTH_PERSON             EBR_PK                                                        /D_CUST_AUTH_PERSON
         2 D_CUST_AUTH_CARD               KKE_EBR_FK                     EBR_PK                         /D_CUST_AUTH_PERSON/D_CUST_AUTH_CARD
         1 D_CUSTOMER                     KDE_PK                                                        /D_CUSTOMER
         2 D_CUST_AUTH_PERSON             EBR_KDE_FK_1                   KDE_PK                         /D_CUSTOMER/D_CUST_AUTH_PERSON
         1 D_CUST_AUTH_CARD               KKE_PK                                                        /D_CUST_AUTH_CARD
         2 D_CUST_AUTH_CARD_DUP           CHILD_FK                       KKE_PK                         /D_CUST_AUTH_CARD/D_CUST_AUTH_CARD_DUP


Relation is
D_CUSTOMER ---- D_CUST_AUTH_PERSON --- D_CUST_AUTH_CARD --- D_CUST_AUTH_CARD_DUP


Heirarchy should be displayed as when childs are displayed complete information of parent should also be displayed.
i.e. root/..../child in our case 
for table D_CUST_AUTH_CARD_DUP path should come as /D_CUSTOMER/D_CUST_AUTH_PERSON/D_CUST_AUTH_CARD/D_CUST_AUTH_CARD_DUP