Harker/Helliwell in Halifax/Bradford

[groom]

That's a nuisance. What was the sister's name, if we can find them in 1881 that will definitely eliminate them? It wasn't an uncommon name as there are 3 Sarah Ann Helliwells born 1860/61 in Halifax. 

[Seasideman]

The death certificate only says E Helliwell.  The initial is not easy to read but that is what I think it is.

In 1881 census in the Helliwell Buildings at Warley in the district of Sowerby Bridge there is a Margret Helliwell aged 71 as Head of Household.   There is one married son, John H and one unmarried son, Ellis.  There is one married daughter by the name of Ellen Helliwell (John's wife and could be daughter-in-law?).  There is one granddaughter and two grandsons.  The granddaughter is called Sarah Ann Helliwell.  The daughter, Ellen, is 25 years old, the granddaughter, Sarah Ann is 20 years old which seems way too high.  The grandsons are suitably young at 3 and 0.

A separate family, at Rails Lane in Midgley, has two granddaughters, Sarah Ann Helliwell and Emily Helliwell.  This means that the two Sarah Ann Helliwells I have found both have sisters with the initial "E".
Damn.

[groom]

The daughter, Ellen, is 25 years old, the granddaughter, Sarah Ann is 20 years old

That Sarah Ann would fit age wise with the one who died aged 28 in 1889.

[Seasideman]

Sorry, I should have checked, but the suggestion in KGarrad's post of "Sarah Ann Willetts" should read "Sarah Jane Willets" according to my search results.  I have sent for the wedding certificate to see if it matches.