How do you respond when one of your siblings accused another sibling of elderly abuse?

One of my brothers accused another brother of elderly abuse, now the one who normally takes care of her is under suspicion. None of the other family members believe it and feels like it was done out of spite. The family has been by the side of the brother that normally takes care of our mother. All we can do is pray for the troubled brother, but we don't like what he did.