WIBTA for making my brother sign a Power of Attorney so I can get more inheritance?

I'm sure my fellow Potatoes are immediately like, "YTA!" after reading that title, but let me explain.

First! Some important details:

I'm female. 39. Autistic. And physically disabled.

My brother (42) is autistic and the "miracle child" (mom was told she couldn't have kids--she wound up with us two). He's also kind-of a small YouTube/internet celebrity (back when YouTube was still rather new).

My brother was diagnosed with autism circa 1996. Since then, he's been kind-of catered to. I'm talking things like not having to do chores because it "grossed him out" or "he was busy" or "he's asleep"; being assigned special teachers and assistants because he was being bullied and hated school; got to sleep however long he wanted because his "circadian rhythm wasn't 24 hours"; and being left alone to play video games ALL. The. Time. He got Disability pay once he turned 15 or 16, and didn't hold any job until 2016.

While he was being coddled and seemingly handed things without him ever having to try, I was struggling with similar challenges and even more (deformed jaw, fibromyalgia, dyscalculia, bi-polar depression, being bullied by my teacher (had the same wretched woman from 2nd to 6th grade)). But I wasn't diagnosed with autism until I was 34, so nobody really figured I had a problem aside from depression. If I said anything, I was just "copying my brother for attention." So I had to work my ass off for everything.

Now, before I get griped at or get called bitter, I just want to say that my brother and I were each other's best friends growing up. We played together almost daily. He tried to tutor me with my math (he'd have had better luck stapling jell-o to a tree). I helped him with his reading (he went on to write novels). He became a rather self-centered jerk after we had been roommates for a year. This is because he blamed me for what happened, which is a whole other story, but long story short, I wound up being even more disabled than I was before.

Anyway, let me move on to this more recent decade of our history...

My brother had moved to the "Retirement" state of the USA because he wanted to swim more. Thanks to a certain virus in the early 2020s, he was "kicked out" of the state (his words) because he was afraid of masks (odd, but okay. I'm afraid of phones, so *shrug*). Anyway, he lived in the Pacific Northwest with a friend for a while after that before getting kicked out. He finally moved back home, where it's winter 9 or 10 months out of the year (and we're colder than Mars (nope, not Canada, but close to it)). He grew depressed, but wouldn't do anything about it because he doesn't think medicine works.

While he was here, mom was diagnosed with three different cancers. She beat the bladder and breast cancers, and fought valiantly against the lung cancer until she died September 18th, 2024.

My brother didn't seem to care, yet still bought a heart-shaped urn for her.

Found out later that he was telling people at his work (my now-wife was one of those people) that he was glad she had died. I wanted to punch him for that. Dad never knew he had said that.

After mom died, my dad went to a lawyer and established a will. He set me and my brother as the executors, with my brother being the primary since he was the eldest.

Well, things were going downhill between my dad and brother. Brother wouldn't do anything my dad asked of him (take the trash out? nope. mow the lawn? couldn't be bothered), so I had to play referee, which was a normal role for me. Lots of arguments over stupid things. Brother even went so far as to intentionally keep dad awake at night by making loud noises.

Eventually, my dad got so fed up with my brother that he wrote him out of the will.

Here's the thing though:

My dad was diagnosed with small cell lung cancer August 12th, 2025. My brother moved back to the "Retirement" state August 17th. Didn't give a flying fig leaf about dad's condition. He was so desperate to get out of our home state that he lived in a cheap motel for over a month until he could buy a house in that southern state (during peak hurricane season, mind you--I still laugh at that). But it left me to take care of dad. Thankfully, I had my girlfriend (who became my wife on Halloween) to help me, or things would have gotten REALLY dark.

Well, dad succumbed to the cancer December 16th (I think mom was yelling at him from the Spirit Realm, "Get your a$$ over here and help me put up these Christmas decorations!" It makes perfect sense if you knew my mom). I got no help from my brother to take care of dad, who was in and out of the hospital throughout November.

Unfortunately, dad didn't change his banks when he changed his will. My brother and I are both listed as beneficiaries on the banks, which means we are both entitled to half the money there. It's not a whole lot, but to me, who had been struggling to get Disability pay for TWELVE years, it's a life-changing amount (imagine being able to buy new clothes for the first time in twelve years--that's where I'm at).

As I stated earlier, my brother is a small-time YouTube celebrity. He gets money from his Patreon followers, he has a high-interest savings account, almost-perfect credit score, and a full-time job where he volunteers for overtime on a regular basis.

He's good as far as money goes.

Because of this, I think I should force my brother to sign temporary power of attorney over to me so I can just get the money out of the banks. That way he doesn't have to "be present" (he lives 2000 miles away) and I don't need to synch my time with his so we can talk to the bank together. A task that he's been dragging his feet over--yet has the audacity to tell me he's waiting for "his money". Brother doesn't know exactly how much money is in there, but I'm leaning towards taking 2/3 of it because I am the one paying for the estate lawyer, the cleanup of the house (mom was a hoarder, and I physically can't do it), the auctioning of the estate assets (mom's hoard, dad's guns and classic cars), then the destruction and rebuilding of the house (it really can't be saved).

So... would I be the a$$hole for wanting to take more of the inheritance?

PS, F**k cancer!