"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.

For baking powder, eye-balling a fraction of a teaspoon in that spoon is good enough for baking. Use weight instead (for all ingredients) if you want any kind of precision and accuracy; measure in grams to make scaling easier. Once you learn this, you’ll never want to go back to cups and spoons.