Anyway, knowing that my Gran, Stella was fond of her Aunt Polly (Mary Jane Agar) leads me to think that she must have met up with her at some point and Gran lived in Hartlepool.
As we know, Polly was 'in service' and at one time was in the household of the son of Titus Salt but I've 'lost' her in between the 1891 census and her death in 1926. I'm not sure why I thought to look for a death in Hartlepool but http://www.durhamrecordsonline.com/ might have helped but I do have a death certificate now.
From thinking a couple of years ago that she might have been pretty much on her own, being an illegitimate child, it cheered me very much to see that when she died, she was living in the household of her half sister Hannah (of whom, much more to come) in Hartlepool and her death was reported by her half brother, Robert.
The death certificate lists her occupation as: Spinster. Daughter of Elizabeth Agar, the widow of Robert Stonehouse, Innkeeper (deceased). The informant was Robert Stonehouse, halfbrother, In Attendance. She wasn't alone.
I didn't know any of this until I bought the death certificate. How much other family history have I missed?