Alright, this is a really crude method and does not involve finding / installing software which may not turn out to be any good anyways, but should satisfy your curiosity. This requires the computers to be on the same workgroup, if you need to know how to check this or change this let me know.
- Jump on his computer, if he has a password to enter Windows I can show you how to break that but assume for the moment he doesn't.
- Go into his MSN - most people have it on autologin or save password as I think that's the default set up.
- Go to Tools, Options, Messages, turn on 'Automatically keep a history of my conversations'. It might be already on, and hope it is if you're
- In Windows Explorer, double click on his C drive and see the Users folder. Right click on that and press properties. Go to the 'Sharing' tab, click on 'Advanced Sharing'. Tick 'Share this folder', give it a name (Such as SonsPC) and press Add. Press Ok to get out of it
Then, you'll be able to browse this folder from your own computer at your own leisure. And it'll be updated in real time each time he uses his computer. On your own computer, you may want to check such folders as:
- SonsPC\My Received Files which is where you'll find files he's been sent from his MSN friends. Within that there's a subfolder where all the history logs are found for MSN.
- Internet History can be found in SonsPC\appdata\local\microsoft\windows\history
Of course, if you have plenty of time available you could just browse those folders on his computer locally instead of setting it up to be shared with your computer. Sharing it has the advantage of granting you permanent access meaning the next day when he writes some more stuff you'll be able to see that too.
If you're wanting to know what goes on inside facebook you'd first have to get his password. This would allow keylogging software. It's been a long time since I've used this type of software so I'm not sure of any current ones, perhaps other posters might. The above stuff should get you what you need, though.
If you need any help / clarification with any of this let me know
I do ask you to consider some of the points mentioned by other posters in this thread, though.