import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OrderBy;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

@Entity
public class Person {
    @Id
    private Long id;

    private Date birthDate;

    @ManyToOne
    private Person mother;

    @ManyToOne
    private Person father;

    @OneToMany(mappedBy = "id")
    @OrderBy("birthDate asc")
    private List<Person> children = new ArrayList<>();
}