Dear fanpop, in the 1st. book The Hidden Stair Case was Nancy dating Ned Nickerson

First of all, the first book is not The Hidden Staircase. Second, if Ты are asking Ты should use a Вопрос mark. Third, Ned just started to appear in the ND mystery stories in The Clue in the Diary. Ned is mentioned in The Secret of Shadow Ranch but they really never met him. The real answer to your Вопрос is NO.

Yes