Elderly abuse; neglect by default...

Elderly mother of four(4) living adult children dies after pro-longed bout with unknown medical/mental problems; one son, witch over-sees care of mother while other three (3) keep her out of sight and thus out of mind! Oldest son over-sees care and lives with her, as he has had an untenable situation with only son, no help from siblings with mother and medical problems; and most importantly, is concerned for mother! Mother passes because of stage-4 colon cancer, which eldest son has been trying to get her help for, as she has been ruled mentally incapable of taking care of her financial duties; this incapacity was much worse than financial, as she would or could not understand that she was very much in need of medical need and support! One might ask; why didn't son get her help! Son did everything possible in respect of law! Sisters grabbed 'plenary guardianship' after father's passing three(3) yrs. earlier! They didn't want to be responsible for her well-fare and that's why her care was left to brother(oldest son) to stay and suffer along with her, as situation was untenable! Since, will settlement has been held up, as sisters are trying best to keep brother off balance and in depressed state, as he and others KNOW just what really has gone on! Mother expressed funeral in will; sisters had her cremated very next day after he passing; same thing was done to father who passed three(3) yrs. earlier, and he was disabled veteran that deserved an military service and all of his friends and associates to attend; both mom & dad deserved an service! He had lived in same town for over fifty(50) yrs. and had a lot of people that would have liked to have known! Same way mother was treated after her passing; no notice in paper, no friends notified, no nothing; it was left to only one that really cared to let as many people know as possible! Damn sad commentary of some that do not care or take responsibility when it really counts...does anyone care or know of similar situation? I, the son that cared, would really like to know! He also intends to sue the hell out of two of three sisters; and would entertain any advise on that also...this travesty needs attention! Maybe it will have some effect on similar scenarios.