If you have your own kids and follow another family — or run an organization too — a switcher in the sidebar lets you jump between those contexts without signing out.
The switcher only shows the contexts that apply to you. If you only have your own kids, you won't see it at all. Once you're following at least one family (see Family Followers) or you're an org admin, the sidebar gains a switcher listing:
The sidebar shows "Create a parent account" or "Create an org" links wherever they apply, so you can pick up a second context at any time without losing the one you already have.