Yes, if they wind up part of a child porn investigation. Your cloud account gets hacked. Some perv gets your images. He is then arrested and his "collection" added to the hash database... including your family photos.

Context often matters more than the nature of the actual content. Police aquire thousands of images with little hope of ever knowing where they originated. If they are collected by pervs, and could be construed as illegal in the hands of pervs, the images become child porn and can be added to the databases.