I had a silly thought recently that if I were to die, my family might have trouble accessing the internet at home. I've personally configured my home network with a good deal of customization, and no one in my family would know or would be willing to figure out how to troubleshoot if there were issues with home network connectivity. They would most likely end up just using a modem/router configuration provided by and maintained by the ISP.

I would like to hear what others perceive themselves to be a single point of failure for in their family/households. Either something stops working if you were not available, or knowledge/expertise is lost if you were to die. It doesn't have to be tech related. I'm actually more keen to hear about non-tech related matters.