This is a rare occasion when I wish that SP had digitised the registrar's copy of the book rather than the one sent to Edinburgh.
The informant's signature is obviously not in the same handwriting as the rest of the document, and I'd be interested to know what anyone makes of it?
This is the death certificate of John Forsyth (1850-1932), son of William F and Martha Brit*n, and husband of Isabella Yuill, Margaret Hogg and Janet Hart Deans. He had four, possibly five, daughters that I know of, but none of them appears to have married anyone with a surname remotely resembling that of his grandson.