When it comes to Stockbridge things do get a bit tricky. During the 1967 Laura storyline we learned that all three Lauras' maiden name was Murdoch. There was the present day Laura Murdoch Collins, who married Roger, Laura Murdoch Radcliffe, who died by fire in 1867, and Laura Murdoch Stockbridge, who, surprise
, also died by fire in 1767. But during the 1897 storyline the writers seemed to forget about all that history (as well as the idea that the Lauras supposedly die by fire at 100 year intervals) and there's also a Laura Stockbridge Collins (Jeremiah's wife?), whose spirit is summoned up by Barnabas. It's never actually made clear if she's a completely different incarnation of Laura or merely Laura Murdoch Stockbridge going by her married rather than her maiden name. :-