The first place I would look would be for the marriage between Margaret and Hugh.
1) Church/civil record and 2) newspaper notice.
You're looking for details that would confirm Margaret's baptism or her parents' marriage, since their names were so common and her father's occupation was not unique. Otherwise, by jumping backwards in time without any firm links, you might find something that you think fits, but you could be wrong.
Good luck in your search!
Regards,
Josephine