Is my airport network secure with Personal File Sharing on?

I have my Airport Extreme connected to a cable modem. I have a G4 tower w/external hard drive connected by ethernet cable to the airport base station. I use a MacBook laptop wirelessly around the house to access the internet.
Each computer is set up for multiple users but we don't use passwords with any of our user accounts. I have Personal File Sharing turned on in both computers and am able to access accounts and drives from the other computer in the house.
I do have password protection (WPA/WPA2 personal) set up on the Airport network itself.
Does the fact that I don't have passwords on the user accounts mean someone outside of my home could get into my home network and access my files?
Does the afp address I use to access the other computer in the house afp://10.0.XXX mean it is restricted to people outside of my home?
Any guidance someone could provide is appreciated.

Does the fact that I don't have passwords on the user accounts mean someone outside of my home could get into my home network and access my files?
No.
WPA (with a strong non-dictionary password) is going to keep everyone off you network.
If they could get on your network, then they would be able to access your files.

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