Airport express - have signal, can't connect from other computers

i'm not the most computer savvy, so i apologize if i don't know all the terminology. i'll try to explain my problem as best i can...
i have airport express. i'm using it as a base station in my father's office and then attempting to connect wirelessly with my laptop and my brother's laptop. i know the internet itself works because my mother's computer, which connects via ethernet, has internet access. my dad's computer, which is, i guess, the airport administrator station, has internet. his wireless signal is, obviously, fine.
for some reason, though, i cannot connect to the internet on either my laptop or my brother's. both computers have strong wireless signals and SAY they are connected, but when i open safari, i can't connect. i've tried EVERYTHING -- reread the apple support stuff about 100 times. i thought maybe there was a PPPoeP issue, but that doesn't seem to be it... i've done a hard reset of the airport express and that doesn't fix it... i've checked all the network configurations and they seem to be fine... the IP addresses on both laptops begin with "10.0.1."something, which seems to be right... i'm stumped.
my best guess is that there must be settings on my dad's computer that don't recognize the laptops trying to connect.
if anybody has any advice, it would be greatly appreciated. if you have any particular places on the apple support page that you think i should look at, just post the link. thanks in advance.
p.s. my dad's computer runs 10.4.5, my brother's laptop same, and my laptop 10.2.6, if that makes any difference.

one more thing... my laptop definitely has the capacity to connect wirelessly, as i use it at work with no problem... it just automatically connects to the strongest signal. basically, everything looks right, it shows a strong signal and says i'm connected to the network, but then i can't get online.

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