Hi Sue
just to rewind a bit... remember John Prendergast and Honora Joyce had a few children including Honora Prendergast 1878, and 2 mmonth old Ann in 1881 who may be the same person

last sighting of the family here with daughter Ann who we think may be Nora...
Dad John's age alters on each census...
1891--
RG12; Piece: 2970; Folio: 101; Page: 65
148 Olivia Street
John Prendergast 59 labourer, b Ireland
John Prendergast 21b Irelannd
Mary Prendergast 14
Ann Prendergast 12
Thomas Prendergast 9
Alison found deaths for children they had apart from Mary and Ann
Found Mary, (and dad John Prendergast), in 1901 married to William Surtees Usher who became a Master Mariner
1901 census
RG13; Piece: 4737; Folio: 113; Page: 14
58 Stoddart Street, South Shields
William L Usher 26 b St Helens, mariner
Mary Usher 24 b Liverpool
Jane A Usher 7 Mo b Durham, Tyne Dock
John Prendergast 50 boarder, labourer, Liverpool
William and Mary/May married in 1899
Sep q 1899
William Surtees Usher
May Josephine Prendergast
S. Shields
10a 1125
Their son is Sydney Usher..
1910 + 1 census
58 Revesby St, South Shields
RG14; Piece: 30334;
May Usher 34 b Liverpool
Jenaie Usher 10
John Usher 8
Florence Usher 5
Sydney Usher 3
Sydney married Nora Davies, daughter of Nora Prendergast & JWD in 1948..... he names his dad as William John Usher, Master Mariner... from what I can remeber we couldn't find him but did find William Surtees Usher and thought it was wrong one, but maybe Sydney has given wrong middle name at marriage...
John Prendergast being grandfather to Sydney Usher is the link I think we have been looking for...
To me it looks like Ann Prendergast, Mary's sister, is Nora/Honora and Sydney Usher has married his cousin Norah Davies.
Simone x.