The Longbottoms announced that all support towards James, Lily, Sirius and Remus was gone and that the Longbottom family would no longer support the Order of Phoenix. With this they cut all ties with the remaining Potter family apart from the main heir, Akira Kurusu. It was pure betrayal towards the light side. That really hurt them, because the Longbottom family was known to be a light family and now, they were abandoning them.