I'm going to try to convince my dad to put my brother back in his will
Thats kind of you. Are you going to try to convince your father over the internet?
Yes, because he is more reasonable on internet than in person.
If your brother has been cut out of his father's will, it is a serious family matter than should be resolved and it's good that you are looking out for your brother. You are right to want to your father to be more considerate of your brother and to repair whatever rift has occurred between him and your brother. While it can be difficult to mediate such divisive family matters, it's important to do so as your brother will suffer emotionally if he isn't on good terms with your father.
Hahaha, he's a dead man once I find out where. Dead dead dead.
Helping out your siblings is commendable but rushing the process of someone dying is not good. It may seem to others as if you're intentionally trying to make them be gone sooner. People might suspect foul play.