I really don't think I will every find a connection. This may just be a red herring. I found a few Albertina Olofsdotter's on Familysearch with father Olof Andersson. I thought I had found the link to Edward's marriage certificate and him naming his father Oliver. Then you sent me the record today which shows Albertina's exact date of birth. I couldn't find it on Ancestry or Familysearch apart from one baptism in Torsby in May 1852. I looked on Ancestry member trees and there is a tree called Live4ever-Matilda - owner BimEngdahl which has Albertina Olofsdotter b. 8 Oct 1851 (as the record shows)Torsby, died after 1890 Gotesborgs Johan married to Olof Sverin Christiannsson Lang (which may correspond to the O S Lang you found his returning to Glasgow. b. 26 Oct 1851 in Brunnefjalli Torsby. (sorry I don't know how to get the correct symbols). All the children I have found - Hilma Lovisa Lang b. 2nd June 1877 Gotesborgs Domkyrko - Gustavi, Maria Constantia b. 2nd Nov 1880 (I found her death in Sunderland) Ameli Ellen Lang b. 1883 England, another Maria Constantia b. 1885 England. We know they were born in Sunderland. They have as Albertina's father Olof August Olsson and mother Laurina Andersdotter.
Sunderland is a port and it is not surprising that many foreigners lived there. It was just the Anderson and Long names together at the same address got me thinking. On the other hand Andersson is one of the most common Swedish names.
Julie
Is Lang pronounced with an 'a' or Long with an 'o'?