5.—(1) A person shall cease to be treated as fostering and shall be treated as carrying on a children’s home if—
(a)he exceeds the usual fostering limit; or
(b)where he is exempted under paragraph 4—
(i)he fosters any child not named in the exemption; and
(ii)in so doing, he exceeds the usual fostering limit.
(2) Sub-paragraph (1) shall not apply if the children concerned are all siblings in respect of each other.