One Computer...Seven People

So right now there is only one working computer throughout my whole house and it SUCKS! I have, including myself, seven people living in my home right now. Normally there would be four people here but my aunt fell down on her luck after her divorce so she moved in with my two little cousins.When they moved in my laptop worked, my mom's laptop worked and my little cousin's laptop worked and now all of them are in the crapper so we had to dig out our desktop. The desktop computer we have isn't all that old but because everyone had a laptop we didn't use it that much now it's on almost all the time. And what is so frustrating is that as soon as I get on the computer like ten minutes later someone is yelling at me that they need to go on and do something. It really is so FRUSTRATING! I'm trying to find ways to get this to work in my favor but you have to bare with me for a little while.