To override a Nestjs/Crud method use the decorator @Override(functionName) Nestjs/Crud Doc

 @Override('createOneBase')
 createOne(
    @ParsedRequest() req: CrudRequest,
    @ParsedBody() dto: Hero) 
 {
    return this.base.createOneBase(req, dto);
 }

You need to mark each class with the @Entity() annotation

@Entity()
class FamilyInfoEntity {
  @PrimaryGeneratedColumn()
  id: number

  @Column({ nullable: true })
  familyName: string

  @Column({ nullable: true })
  parentId?: number

  @OneToOne(() => UserEntity, parent => parent.id, { nullable: true })
  @JoinColumn()
  parent?: UserEntity
} ```