Brucey you're a top bloke, you did your duty and looked after your dad in his last days. You can be rightly proud of yourself.
Now you must take time for yourself to mourn your loss, however you must also do the right thing by your fathers estate (assuming you are the oldest sibling) and make sure it's protected and correctly dealt with. Tell your brother to sod off until after the funeral and then your fathers property will be dealt with. Stand your ground and don't let him use your weakened emotional state to push you to do something you are not happy with.
My deepest condolences and I wish you well.