Remove nesting from wp_list_pages()

I am trying to make it so that the grandchildren pages links in my sidebar are shown when the parent link is clicked. So instead of having a nested list where you have to click the parent link, then the child link to show the grandchild link, the grandchild link will display when the parent link is clicked. I hope this makes sense. Anyone know how to do this? I have been looking all over for a way to do it, but haven’t been able to find anything that helps.