The 1841 census has a Richard Sharples living with Thomas and Ann Immison and children.
HO107; Piece: 503.
Again on Lancsopc there is this marriage
Marriage 1 Jan 1823 St Mary the Virgin, Blackburn, Lancashire, England
Thomas Eminson (X), Weaver Bachelor, This Parish
Ann Sharples (X), Spinster This Parish
Witness: Robert Hutchinson; Ellen Sharples, (X)
Married by Banns by Jno Will'm Whittaker Vicar
Register: Marriages 1821 - 1823, Page 207, Entry 619
Source: LDS Film 1278807
Given that the witnesses on Richard's 1864 marriage were something that looks very much like Imimson I think that this could be the correct record.