What do I do when I see a former client being taken for granted?

Recently went to visit a former client who has a caregiver that is taking him for granted. She has moved in to his home. She has removed his late wifes decorations from the walls. The house is a complete mess. He was dirty & had on dirty clothes. I sat down with him & asked how he felt about all of this. He says that isn't anything we can do. He almost feels like he is stuck with her. She has him wrapped around her finger. She tells everyone the same old story. Her son killed himself back in may of 07 then that same year her husband left her. I told her that everyone has a hard life that is what makes us stronger. I know what is like to lose a child & be divorced but I moved on & now am remarried with 2 beautiful boys but she didn't want positive feedback she wanted sympathy. I left that crying cause I felt so guilty for not being around more. I wrote his son a letter telling him what I saw. I guess I'm asking is, Did I do the right thing?