wireless router capabilities

I have a PC I want to share data with my 2 laptops. All 3 are connected wirelessly thru my nieghbors internet connection. I dont want to share the internet, just files. I have 2 different wireless routers, can I accomplish this without a modem? Considering I dont want internet capabilities? I have a modem, just no internet to it. Please help, lost as heck, RB