It sounds like you have him in a pretty good setup, though the temp is a little low, you want him closer to 78 to keep him warm.
If your brother is scaring him, I would move him to a better place, maybe higher up, or in your own bedroom. If your brother is going to keep tapping on the glass, there's really nothing we can tell you that will help ease his skittishness.
As for cleaning, scooping him up in a cup is the best way to go about it. You can leave him in the cup til you are done cleaning the tank, but keep something over it, he can jump out. By far the easiest
way to drain water from a tank is useing an air line and siphoning it out. Just put an empty bucket lower then the water level of your tank, put an air line (you can get this at any fish supply store or medical store) so one end is in the tank water and the other end is in the empty bucket. It'll have to have some water in it to get started, but once you get it going, it'll drain your tank pretty fast. Same thing to refilling, just put the new water at a higher levle then the tank. I do this for partial water changes once or twice a week, when I just want to drain half of my betta's tank.
You can buy a gravel vacuum at the pet store and clean the poop off the gravel with it, which is easiest, or do the old manual hand cleaning. The sides can be wiped down with a simple spong, just no chemicals.
Hope this helps.