Not to burst your bubble, but don't take this squirrel lightly. I live in an apartment building that was INFESTED with squirrels in the attic. I, too, would bang on the ceiling in a desperate attempt to get them to stop. My landlord refused to take any action until I threatened him with LEGAL action. Then he called an exterminator who trapped and boarded up the holes with hardware cloth.

Where you find one, you'll find more and they are very destructive. They leave behind an odor that attracts more squirrels....and so on, and so on, and so on. The ones who live in houses are rogue squirrels and are far different from the cute little ones you see outside in the park. My advice to you (and your mom) is to either call an exterminator or start trapping them yourself. You can read all about it at this site.

Here is a link that might be useful: United Exterminating Company

My parents actually live in rural PA and have dealt with the little critters many times. They even periodically have to clean out the innards of the car under the hood because of chipmunks building nests up there. I just thought that this particular squirrel was quite the comedian dropping that nut and letting it roll over and over again.