I've been told by someone formerly connected with Genline that Ancestry.com has been steadily uploading scans from Genline. I forget how often this was done, but I think it might be once a month or so.
At any rate, Genline has births, marriages, and deaths scanned until at least 1938 and I think they are done up to 1940 in some parishes. Those scans will eventually get onto Ancestry.com. (Have you checked the SCB records, by the way? Those are extractions made from the full birth, marriage, and death records for statistical purposes.)
I checked Västra Frölunda on Genline and its later records are the SCB records. (Select SCB instead of the parish name.)
The SVAR service has those records until 1940 (soon to be 1941) on that fee-based service.http://www.svar.ra.se
This tells how to find them.http://researchingswedishroots.blogspot.com/2011_09_01_archi...
I also see records well into the 1900s on the fee-based Arkiv Digital site.http://www.arkivdigital.net
There are cds for the 1970, 1980, and 1990 Swedish Censuses. (yes, the late 1900s!) If you have DETAILED information about descendants, ask here and someone with those cds will do a lookup. (You will need to provide your email because information on living people should not be placed online.)
If you get a lookup on the dvd "Swedish Death Index 1901-2009", then you can use that information to ask for a bouppteckning (estate inventory). That should provide the names of the children still alive at the time of the death of that person.
Use this page to order a bouppteckning.http://www.riksarkivet.se/default.aspx?id=17462
This is a translation of that ordering page.http://translate.google.com/translate?sl=sv&tl=en&js...
Once you have information on those people from the bouppteckning or the later census cds, you can use a site such as these to get contact information.http://www.birthday.sehttp://www.ratsit.se/http://personer.eniro.se/http://www.hitta.se/
The first FAQ on this page provides some other ideas on how to try to find living relatives in Sweden.http://www.augustana.edu/x14885.xml
I'm glad you aren't waiting until a week or so before your trip to ask this question. (It is hard to believe, but I've seen such tardy questions a few times.)