If it helps, you shouldn't use a mic, or do a video while you're brothers are gone, to make it easier for you. Great video!
Nice video, but if you feel like your brothers will ruin the video, just add music and no talking, and write up an explanation in the description. Still though, add some text like "Today we will be playing Survival!", etc. Good Luck in your channel!
Good luck with your videos! If it helps, you might not use a mic or play when your brothers arent in front of you, so there wont be any noise.