Is it possible to network a computer from one home about a mile away from a computer in another home?
I'll guess that you are looking for a wireless method to let a computer in one home share the other home's cable Internet connection.
Depending upon geography, it's possible to use point-to-point wireless bridges to connect two sites that are one mile apart. To learn more, check out my recent answers regarding wireless bridging and connecting two buildings with wireless.
However, you should first consider getting Internet access directly at the home that does not now have it. For example, if cable Internet is not available to that home, does any provider offer wireless or DSL Internet service? (Check availability here.) Using public Internet connections is often less expensive and easier than setting up your own private point-to-point link to connect two sites.
Dig Deeper on Wireless LAN (WLAN)
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