Passing data to components with Vue

I have a couple of Vue components that exist on a page in Spark. In the DOM, one works in panels within the container, and the other exists outside of the container (in a sticky div at the bottom of the window). What I want to do is send data from the Vue component in the container to the sticky div component: someone will click on a button in the container that will change what is shown in the sticky div. Do I need to make the sticky div component a child of the container component (or vice versa)? Or is there a way to pass data between these components without having to nest one in the other?

Or is the answer to create a parent component that has both of these as children?

Thanks!