The story I've always heard is nobody thought there would be war in Europe to the magnitude of WWI because so many heads of state were Queen Victoria's grandchi

The story I've always heard is nobody thought there would be war in Europe to the magnitude of WWI because so many heads of state were Queen Victoria's grandchildren. Surely the family wouldn't war with one another? I just did a quick search on the topic and found this link: https://www.history.com/news/queen-victoria-grandchildren-matchmaking-wwi https://www.history.com/news/queen-victoria-grandchildren-ma... Well, we saw how that turned out!