My wonderful grandma passed away recently and left my dad and his brothers with a sizeable amount of money. She had worked her entire life into her 80s and barely spent anything, so when it was time to get a new car a few years ago, she walked right in and bought a $20k+ car in cash. She had been living with cancer for a few years and last year was put into hospice, at which point she put the car in the garage and no one used it for a while.

My brother is a great guy with many talents but has been just horrendous with money and responsibility his entire life, into his thirties. Every job he's ever had he's been fired from, and he will often go months without even trying to get a new one. He's nearly been evicted multiple times and was saved by the fact that his landlord is a really understanding person, coupled with my parents usually bailing him out. Every car he's ever had he's gotten for free and is always broken because he refuses to take care of things until it's too late, and he rarely even has money to pay for something as simple as an oil change. My grandma had already bailed him out of signing up for college classes before dropping out weeks into the semester multiple times. He couldn't even be bothered to call and thank her when she would send him a birthday card most years.

All of our lives I've always been the responsible one, but I often don't have money or a fully functional car myself (my job doesn't pay very much). My dad and the rest of the family didn't give me much help because I always found a way to make things work myself or went without, even when I really needed help. My dad began lobbying for my brother to get my grandma's car while she was alive, and she just kept pushing off the subject. When his car broke in the last few months of her life, she said something to the effect of "Well, sounds like you need to get a job and save up for a new one". This didn't deter my father from continuing to push.

Now that she's passed, her will was bare bones and her money is being divided amongst her sons (my uncles), we grandchildren don't get anything (which I was fine with until now) and the plan was to sell the car. However, my brother contacted my uncle (the executor of the will, real responsible guy) and the two of them along with the other brothers somehow came to an agreement to "sell" him the car at an extremely discounted rate, paying in tiny installments. I had previously offered to pay in installments for close to the full value, but they're apparently selling it to him for much less because he "needs a car".

My problem is my brother has never, ever, ever fulfilled a financial obligation in his life. He owes all of us money already and pretty much everything he has he's gotten for free. When he can't pay for something or loses his job, he cuts off contact with everyone for weeks at a time and just waits for someone to bail him out again, which always happens. I'm not sure my uncles who agreed to this are aware of this, and when I mentioned to my dad that I would like to let them know before this inevitably blows up into a situation where they have to learn it the hard way, he blew up and accused me of trying to ruin my brother's life. I know this will absolutely turn into him never paying for the car and forcing the family to give it to him for free.

We've never had a situation where our family was fighting over money or assets before (even though none of us have ever had much money), but I'm pretty certain this will turn into one when they realize they can't make him pay and he's not going to. AITAH for taking issue with this and wanting to fill everyone in before it's too late?