Can't seem to restrict access to screen sharing

I'm running a macbook pro (10.6.2). I'm at my folks' place for the holidays and I tried screen sharing into my MBP from my dad's iMac (10.6.2) and noticed that I could access the MBP screen without any password prompt.
I went into my MBP sharing system preferences and set screen sharing to: "Allow access for only these users: <my login>"
Again, I tried accessing my MBP screen from the iMac, and again I was able to get in without any password prompt.
Now I'm using my dad's login on his iMac, which is completely different from my MBP login which I thought I had limited screen sharing to. All of this is taking place within a home network.
I would like to allow screen sharing on my MBP, but only if it's password protected. Can anyone see what I'm doing wrong here? Why does my MBP keep allowing open access to screen sharing when it appears that I am restricting it to only my profile?
I tried messing with the options in "computer settings", but that didn't seem to help either.

I would suspect that the first time you did it (may have been a while back) the password was saved in your father's keychain on the imac.
open keychain access on the imac and see if it's there. if you delete the keychain entry for that password it should ask again next time you try to connect. and don't check the box to remember the password in the keychain.

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have you tried the obvious - restarting the computers involved and the router?

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Hi
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