Lovely story, Eowyn, For sure, many moments of the "small world" within our global community of WikiTree happened to me. When I started at WikiTree many moons ago, I was volunteering as a greeter, and in pops my long lost cousin, Cindy, from Ohio! Needless to say, her encouragement of our family history keeps me going at it.
Another 2nd cousin was already on Wikitree but I never knew it. He was from a long-lost paternal Aunt of my Grandmother in New Jersey. He was the final reason I finally succumbed to a DNA test which opened up a whole bunch of interested family members from Poland living in the USA who had photographs and stories.
On my Hungarian side, I knew that my Great-Grandfather Nagys' siblings had no descendants. Also knew that many of his father's siblings seem to have died at birth as well except one, WHO I FOUND ON WIKITREE! That day She was a regular genealogy blogger I followed and there she was on WikiTree with family connections.
It's simply marvelous how wonderful it is.