I'd like to know how a person can use, abuse and exploit their Mom and get APS to believe I'm the problem to cover up what she's doing?

You are most probably dealing with a control freak. You need to expose her. That won't be easy, but the truth will come out one day. Good luck.

You could always take the complaint to the local sherriff and tell him the whole story EVERYTHING!

I don't know if an Elder attorney can help in this matter or not. I know they deal with the financial issues but they might be able to tell you who to contact and how to document everything. is there anyway you can secretly put in a hidden camera? it sounds like they are there all the time and that might be impossible. I sure wish you luck.

A person with midstage dementia does not have their right mindset. With your felony I even question your ability to care for your mother, and there are always two sides to every story. Perhaps you could channel all that rage into more constructive ways or release it, and try to get along with your sister. If not, your mother has a terminal disease and it will be moot soon. Do not let your anger ruin your health and get some professional help for your issues. Best wishes.

I don't know what the felony was for, but can you write down a timeline of what you have done to change, and how you did it. For example, went to rehab, attend AA or NA meetings, have a sponsor stick up for you, joined a church, held down a steady job. You need to prove you have turned your life around before before authorities will even consider placing your mom with you. If you can't, then you have to think of what is best for your mom. If possible maybe she could be placed in assistive living where you could see her everyday. The hidden camera idea is fantastic. The truth will surely come out. Keep your head up, and don't let your past, control your future.

You absolutely should not be using the name of any APS person in your postings. I would start by removing or modifying this posting with that in mind.

If your true concern is about your Mom, then you should start by asking for an investigation and for the court to issue a temporary conservator to care for your Mother. You can then give the state time to investigate everything.
You are making serious allegations and if someone is lying to APS or vice versa, there will be serious ramifications.
Hang in there and remember, your mother is the one that needs the care. The last thing she needs is anything to cause her more distress.

When someone is controlling and very good at manipulating, it's pretty easy to cover up what's being done that they shouldn't be doing. That's usually because agency reps/social workers/Docs, can't afford to take enough time, enough different visits, to catch them out; they rely heavily on others reporting, then they use all the data [hopefully] to come up with a [hopefully] good solution.

It's terribly upsetting for one relative to over-lord the elder, taking advantage of them in any way, and/or mistreating them in any way. It is also common for one or more persons in a family to have a greater sense of offense when something done is questionable--that needs to be worked on to help yourself hold on to a more level-headed calm; because once a person loses their calm-centeredness, they've lost the battle--no matter what that is.

1. As someone posted above, YOU need to put YOUR ducks in a row: put together documents or diaries that show what you've been doing, for how long, with names, dates and what, to pull your life together on the right track. That supports that you are fit [or not] to be guardian and/or caretaker of your Mom or anyone else.
2. When you know something's happened...verbal, but mostly physical, call to report that to 9-1-1. That starts a collection of records with the sheriff's department. IF you know off other people who have witnessed your sister's mistreatment of Mom, and they are willing to also file reports with the sheriff's department, please have them also do that.
3. You can also call to have well-checks done by the police/sheriff. This can be anonymous. And, it could be that neighbors have noted loud yelling or whatever--so they might have called to report things going on there, too.
4. Keep a diary or calendar; write short notes each day you speak with mom and/or your sister. Write down what was said or done. A Calendar with daily notes, becomes like a log-book, and usually is admissible in court as evidence.
5. Has your sister filed a restraining order against you? That may be a moot point, if APS gets involved.
6. Talk to your State's Elder care Ombudsman office. They Might be able to look into it, but that office is mostly in charge of nursing home issues.
7. Area Agency on Aging has volunteer lawyers. But, those can be any specialty, and the one you get to talk with, may not specialize in what sort of legal help you need....then they simply refer you to those who do that. But, you can look in your local yellow pages, and find lawyers who specialize in elder care issues....some of those might have 30 minute free session offers. Be sure to only have a few questions--lawyers are notorious for giving a lengthy dissertation on only one question, side-tracking actually answering it!!!
8. You MIGHT consider contacting officials, filing your reports, to get Mom removed from not only your sister's care, but also from yours or any other siblings.
Mom would be put in a care home or facility, where more people are present doing care, and, there are more rules to be followed, officially. That way BOTH can visit and even participate in Mom's care, but Neither of you get's custody.
This Can possibly go as far as to have the judge appoint someone else as Mom's guardian and who also takes care of her funds/finances. That means neither of you get to control Mom or her finances, nor take any sort of advantage of her--she effectively becomes a ward of the State, and others are in charge....but the person in charge can then state who gets to visit, how long and under what conditions--that is Usually more even-handed than many relatives can be.
IF you contact APS, include the statement "If mom is removed from Sister's home-care, and IF the State does not see me as a fit person to take that task on, then it's OK with me if the State takes over her guardianship and care of her affairs: I just want Mom to be safe and properly taken care of!!"
That statement by you, attests to your observations, your willingness to take on the care taking job yourself, AND your willingness to relinquish all control the State, if they deem both of you inappropriate.
Being willing to give that up to the State, Might help them take your reports of mistreatment more seriously. AND, you have to really mean it. Because if there is much reporting on how an elder is being mistreated by their caregiver, consistently and chronically, that might be the outcome.

Work on learning how to be at peace with yourself, and building a life for yourself.
You didn't learn how to be dysfunctional in your life, from nowhere--you learned it at home...which means both Mom and sister are also some levels of dysfunctional.
You must decide what goals you want for your life, then consider how your family members fit into making your dreams happen. If they in reality look like they will keep you tied down to your past messes, then ask yourself, if it's worth sticking anywhere near them?
Or, maybe only long enough to make sure Mom gets proper care in the last bit of her life, then you take leave of your sister and her behaviors?
IF you go ahead with all this reporting and working to get Mom removed from sister's, what might the retaliation actions be, by your sister? Are you ready for that?
Do you know how to set rational, realistic limits on other's use of you and your assets? When you make a decision based on the best information you have, how able are you to stick to that, and stick to your limit-setting consistently?
It's very hard to make those decisions, but your life may depend on it.
I hope this gets straightened out well for all involved.

Perhaps it would also help to remind those who post on this site that, for privacy (and possible legal) reasons, and whilst it might be OK in certain circumstances, to use family names, other names should not be used without the permission of the person named.