Children. They have no power and no say in their lives. If that is coupled with poor parenting, it is the saddest thing on the planet. Children, who spend their childhood being "unheard" break my heart.
I would agree - the elderly that are "put away" so to speak, who don't have a lot of assets / money and have no family to visit them. They are brushed aside like nothing. I agree children as well, but children seem to have a lot more advocates.