Thank you for that. Wilhelms both children are deceased so grandchildren (my husband is one) would be next in line. Will check out cost of ordering certificate at National Archives. Would love to know what he died of.
Yeah, I wish I could help more, but my experience with them so far has been quite confusing (and I'm Swedish!)
See attached death note in the Swedish newspaper Dagen Nyheter printed on the 10th of December 1964. (I have no idea why we are suddenly able to access these records, since we have a 115 year copyright law, but I'll take it!) Unfortunately it doesn't say how he passed away.