How do I set state of sibling components easily in React?

I have got the beginnings of a clickable list component that will serve to drive a select element. As you can see from the below, onClick of the ListItem, I’m passing the state of a child element (ListItem in this case) to the parents (SelectableList, and CustomSelect component). This is working fine. However, what I would also like to do is change the state of the sibling components (the other ListItems) so that I can toggle their selected states when one of the ListItems is clicked.