You have posted on the USA General message board and yet you haven't mentioned anything about the USA--it sounds as if your query pertains more to Sweden. Please correct me if I missed something as to the reason you have posted on the USA General board.
If the people you are looking for were in the USA and you know more specifically where they settled in the USA, please post your query on the county or State Unknown County board -- whichever is applicable. if the families remained in Sweden, please post on the appropriate Swedish board. Or, as an alternative--post on the applicable surname board.
USA General message board