Yeah, the little "tiddlers" as the British call them; as youth from my age we generlly thought who would buy some thing you cannot get more than groceries in. or in a more practical , all your friends for a road trip.
The VW and Isetta were , outside of a few British two seaters, were the only ones in my home town, AND, even though we were hot rod gear heads, thought the little Isetta was really cool.
OH yes, as my parents and grandparents spoke German, the VW was a Folds Vagen. 
Yes, I intyended on showing the BMW Isetta too....Perhaps I'll do that next. Corectt it is FolksVagen..or translated "Peoples Car"..
I soon learned that Vs are pronounced as Fs ...and Ws are pronounced as Vs. I suspect your grandparents were immigrants, so did they have difficulty pronouncing our TH sound ? Germans in the homeland have trouble saying other than the regular T sound instead.
This was used during that Battle of the Bulge, when MPs were checking for Otto Skorzeny's infiltrators, behind our lines.
In the same way, they would ask our troops to say the number 88 ! ....And I can't convincingly speak it to this day..

My Uncle John, who was very intelligent, and fought in WW2, said the great German gun used in tanks and artillery was 88mm instead of 90mm, because H is the 8th letter in the alphabet, and thus 88 was a salute. To wit, Heil Hitler..
After a search... here's how 88 is pronounced.
https://www.youtube.com/watch?v=ejWGdnC3rnI