"Like what kind of person is left an entire house and thinks "yeah, I deserve all of this and my siblings deserve nothing"
The person that was there taking care of the parents, getting them to doctor appointments and taking time off work to provide for them while everyone else was absent physically and/or financially. Nobody else cared when they were alive, they dont get to care now that they are dead.
A lot of tech evolves and changes quickly, and a whole lot of people just dont like change, especially as they get older. It is also harder to learn new things as you get older. While it doesn't apply across the board, the "can't teach an old dog" addage generally holds true. This is not something that will go away. If you dont want to become that person, continue to exercise your brain as you age, and learning new tricks will be easier.