Hello Stas,
Hope this isn't getting too far off the track, but have you considered that "Lavinia" (witness to Ann's marriage) might have been a sister to Ann E. Broughton? Was possibly even her twin per 1881 York census
"Joseph C. BROUGHTON Head M Male 38 Kingston Upon Hull Auctioneers Clerk
Jane BROUGHTON Wife M Female 41 Brigg, Lincoln, England
Anne E. BROUGHTON Daur U Female 15 Kingston Upon Hull Dressmaker
Lavina BROUGHTON Daur U Female 15 Kingston Upon Hull Scholar
George W.M. BROUGHTON Son Male 7 Kingston Upon Hull Scholar
Jesse BROUGHTON Son Male 4 Newington, York, England Scholar
John BROUGHTON Son Male 3 Newington, York, England Scholar
Amy BROUGHTON Daur Female 1 Newington, York, England
Maude GRAHAM Visitor U Female 18 Stockton On Tees Domestic Servant"
Father Joseph C. appears to have married (most likely) Jane Pounder in 1864.
Hope this helps a bit.
Nick