Hi Janine,
Sage, Sandra & JJen have posted a lot of good info. here on your line which is fantastic.
I haven't researched Thomas who I last noted in 1898 as informant on my gg grandmother Rose Ann's death cert.
Agnes though, sadly died 16 Dec 1894 aged 11 yrs & her mum (my gg grandmother) Rose Ann was informant :-(
Rose Marie's mother Annie was indeed a daughter of my g grandmother Rose Ann (half sis of Sarah) who married Angus MacKinnon.
I will send you a PM over the weekend with what I have.
Anne Marie.
ADDED...............Thomas Gunn, father of Sarah died 15 Feb 1897 in Motherwell, Lanark, Scotland