Mac connected to modem by AE and modem... mac won't recognize it

this is officially the most perplexing problem i've come across with my macbook...
At home I can connect to my internet with airport and it works perfectly, however, lately i can't connect anywhere else...
I'm at my sister's house and I know for a fact that the modem recognizes the mac... it's connected... it has an ip address and everything... yet it won't connect to the internet... assistant and diagnostics were of no help...
my brother in law is a computer whiz and is scatching his head at this one...
we even connected the mac to the modem via ethernet but my mac refuses to recognize it.
if anybody knows what i can do, i'd really appreciate it since i'll be sans a connection on my laptop for a while if i don't figure it out...
thanks in advance

When attempting to access the Internet using your MacBook's AirPort while at your sister's house, note the DNS Server IP addresses that your MB is getting from her wireless router.
System Preferences > Network > AirPort > Advanced... > DNS tab
Are the IP addresses the ones for your ISP or hers? Chances are that they are still yours.
Have you tried creating a new Network Location which is specific for your sister's network? You can then switch locations depending on where you bring your MB.

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