sibling = self.parent.children.filter(parent_number__lt=self.parent_number).order_by('-parent_number').first()
if sibling is not None:
return sibling.get_last_text()
sibling = self.parent.children.filter(parent_number__lt=self.parent_number).order_by('-parent_number').first()
if sibling is not None:
return sibling.get_last_text()