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SQL statement

SQL statement

(OP)
I am using the following SQL statement to create a table and upload data using atxt file.
CREATE TABLE family (
person_id            NUMBER (4) CONSTRAINT person_pk PRIMARY KEY,
Fname                VARCHAR2 (20) NOT NULL,
Mname                VARCHAR2 (20) NOT NULL,
surname              VARCHAR2 (20) NOT NULL,
sex                  VARCHAR2(1) NOT NULL,   
dob                  DATE NOT NULL,
death_date           DATE,
father_id            VARCHAR (4) CONSTRAINT bperson_fk REFERENCES family(person_id),
mother_id           VARCHAR (4) CONSTRAINT aperson_fk REFERENCES family(person_id));

Once the data loaded this error message shows for each failed row:
ORA-02291: integrity constraint (USER1.BPERSON_FK) violated - parent key not found??
I cannot figure out the problem
Help welcome

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