Question about internet security...please help!

Hi everyone,
I have a question about the macbook's internet security.
A few days ago I became aware that my sibling was using a laptop for internet use at my house which he got from a person that I do not trust. He is very computer-savy and we're worried that he may have installed some form of spy ware on that laptop and in turn, may have tried (or succeeded) in accessing my Macbook through some form of spyware. My house is hooked up with a D-Link wireless router, and at the time, it had no internet/access-password.
So my question is, could this person have accessed my computer and personal information remotely by and through the laptop that my sibling got from him. I was under the impression that Mac's have very strong firewalls, but I have also heard that as long as he knew what he was doing, he could have accessed my computer. I don't have a wireless "network" set up at my house, I just simply use the router for internet. But my sibling told me that this guy was his "network administrator" which leads me to believe that he must have had remote access to the laptop.
Can anyone with knowledge on this problem please weigh in and let me know what I need to do to confirm that no one has accessed anything from my macbook.
Thanks!

One option if you want to be extra safe is turning on FileVault (System Preferences -> Security), which will encrypt everything on your computer so that if somehow someone does gain access to your computer they will have a next to zero chance of being able to read anything they get from your computer. You have to have a lot of extra hard drive space on your computer to turn it on though.
Also, a "network" is just a connection between computers, regardless of the internet is involved or not. So when you connect your computer to the router which gives you the internet, you are putting your computer on a network. Now I believe that in order for this person whom you don't trust to gain remote access to your computer, they would have to have more information such as an IP address for your computer, through the router in order to get to it.
One thing I think is very important to consider that isn't on the technical side of things is something called "Social Engineering" which is a form of cracking, or hacking. You can do your own research, but in a nutshell Social Engineering is getting people that have access to something I'm trying to hack to give me information. For instance, this person you don't trust could be giving your brother the computer in the hopes that he will download something through your router to that laptop which could give him IP addresses and other information. And then when he gets that laptop back he could scan it for useful information and your brother wouldn't know he did anything wrong at all. The best way to avoid this is purely education and communication. Even if your brother doesn't share the same suspicions about this person, surely he will understand the need to be careful and smart when it comes to sharing personal information in the digital world.

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