Long Story
As a family, we experienced the incompetence issue with my Father. I am the only son, and I prepare their taxes. When he would send me various bills and check stubs, I began to notice past due fees and threats of cancellation. I asked Dad about it, and he always had an answer. The 4 kids and Mom all decided that it was time to consolidate the investments (he had about 25 stock certificates in the safe in the basement, and the dividends were mailed to the house. Only about 75 % of the checks were deposited in a timely manner!
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I arranged to be at their house the same weekend as a class reunion for a sister (DS2). That meant that 3 of the children would be at the house for a weekend (one, DS3 lived about 4 blocks away). The eldest sister DS1 (Dad's favorite) had to work and couldn't make it, but was fully on board. One of my BILs is an insurance agent and investment advisor (no, we don't rely on him for investment advise, that's another story), so when my DS2 came to the house for her reunion, she brought stock transfer forms for Mom and Dad. We managed to start a conversation about the stock in the basement and the fact that the safe weighed over 1500 lbs (no one was going to remove that safe without serious equipment!). DS3 went down and got the "papers" from the safe, both the stocks and other paperwork. After a few minutes of lively discussion (making sure Dad was involved, but not guiding the conversation, Mom "decided" that her stocks should all be transferred to a brokerage account with my BIL. DS3, an attorney, started filling out the transfer forms for Mom and for Dad. when she was done, we managed to get a notary to witness Mom sign her forms, and the pressure on Dad was too much and he relented (though he did threaten to call DS1 and get her to side with him). DS2 left for the airport with the paperwork and it was out of Dad's hands.
For the following week, I was going through their checking account simplifying the bills (in the north, the gas and electric companies love to have family members call to set up direct pay plans for their parents, apparently, the risk of fraud is much lower than the liability and bad press of an elderly person freezing to death due to non-payment of bills). We added my sister as a signer (not an owner) on the checking account (the bank refused to accept the POA that we had. My DS took off the loving daughter hat, and put on her legal hat, and asked the branch manager to contact legal and have them explain to her that a legal POA doesn't have to be on the Bank's form. After much arguing (which embarrassed Mom at first, then made us all laugh), the Bank's legal department accepted the POA and apologized to all of us for the misunderstanding.
When I left, all of the stocks were in a brokerage where the dividends would be deposited, not mailed to the house, the bills were nearly set on automatic draft, my DS3 was a signer on all of the accounts, and Mom and Dad could relax. Mom thanked all of us profusely for the next 6-8 months as she saw no more past due bills and wasn't worried that the money was running out. At Thanksgiving, I called and after talking with Mom, asked to talk with Dad. He was very sullen and when I asked why, he responded "Why shouldn't I be, you cut my b*lls off!" I don't think he ever forgave me for taking the control away from him, but it was the right thing to do. My sisters couldn't have done it (Dad was old school and it was the man's job to handle finances) without a lot more fighting and tearing up the family. As it was, Mom and my sisters thanked me for recognizing the problem and taking the "hit" in the resolution. Every one's situation is different, so take my example with a grain of salt.
BTW, Dad died about 6 years later, and Mom is glad that the finances are being overseen by DS3 and I. She pays her bills (though at 89, she is giving that up as well) and asks questions about her overall situation, but is not worried about $$.