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I'll answer your second question first. You can't.
The wireless algorithms are based on WEP. The manufacturer will tell you it is "128 bit secure", however that is a public key based on a public algorithm that has been exploited to death. Programs like WEPSnort are designed to sample enough data to masquerade as any authorized device on your network. Yes, that means read your mail, access your resources, pretend to be you, etc.
Having said that, if you have a wireless hub or router, you can just get a card for your Dad. It's pretty easy to set up. It's just as easy to exploit.
One caviat; The effective radius of transmition is pretty small, so if you live on a larger property where folks can't physically get to your radio signal, you're in better shape.
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