A William Shortman married Sarah Ann Williams on 24th Dec 1882 at Salford, Lancashire.
On the 1891 Census at 21 Commission St, Salford, Manchester....there is then the following family:
Wm Shortman aged 27 b Bristol
Sarah A Shortman 27 b Manchester
Minnie daughter 7 b Pendleton
William Son 5 b Salford
Sarah L daughter 4 b Salford
On the next census for 1901, at Gardner St, Pendleton,
the household is now as follows...
Wm Shortman aged 36 Whitesmith Cycle Maker Worker At Home born Bristol
Sarah Ann Shortman wife aged 36 born Gorton, Manchester, Lancs.
William Shortman son aged 15 Whitesmith Cycle Maker W At Home b Pendleton.
Sarah Eliz Daughter 14 Cotton Mill Worker b Pendleton
Florence Daughter 11 b Pendleton
Ada Daughter 8 b Pendleton
Jno Son 3 b Pendleton
Hope this helps. Check it out though,
P.S. Regarding William Shortman (born 1886 on the above two census returns), I think this is the William who married Ellen Taylor in 1903, because you already have his army papers saying that he was a Fitter, Cycle Maker & Electrician from Pendleton. I am pretty sure it is the correct family.