My sibling is grossly neglecting our elder parent who has dementia. What can I do?

APS and courts are worthless, Caregivers documented abuse, SOS. I desperately need help in getting my parent the assistance she needs to live a full life. She lives alone. and has for 13 years. In 2007 she had a stroke and one year later my younger sibling who is a failure to launch adult still living with our father and being supported has assisted our mother to change her trust so that he is now DPOA.. I had been in place as such and was never notified of this change.
My attempts for the past several years to care for my mother have been presented with isolation and my sibling has informed all involved to NOT communicate with me regarding my mother. I have a court order which states he is to communicate and cooperate for the good of our mother, but he refuses. The court has done nothing and I have spent way more money than I have to protect my mother. My sibling is spending her money, He doesn't and has not worked for 20 something years. Mom has a substantial amount of money to care for her needs and he is unwilling to let it cover her needs. He is angry about his parents divorcing 13 years ago and Mom got what she did and never worked for it. He is determined to get back what his dad worked hard for all his life. My brother had purposely estranged himself from our mother at the time of the divorce and I need to call in a civil standby for her to take her things since by brother was unwilling for her to take anything.
I am desperate. Anyone with any suggestions or help. Please!!!