2 @ a time ???

the isp do that for security, if they give 1 username and password, surely they dont want 2 people to use it,look at it from your there side that username and password is already in use and therefore the "line" for that username/password is busy, assoon as line becomes free then your father will be able to connect.
solutions........no honest solution anyway, an option is multilink but i dont even think that will work and it wont be cheap, you wanted a cheap/free solution right.
there is no way for both your father and you to connect at the same time with the same username/password.

Connecting two at home is fairly easy using Internet Connection Sharing. You would have to create a small network, but it is easy as well as inexpensive

There are number of ways that this can be done... and some of them rely on the watchfulness of your ISP. A couple years ago when i first got DSL, the ISP wasn't watching closely and getting two computers on the net was as simple as setting the second computer to use the same TCP/IP gate way and DNS servers and turning on DHCP to grab an IP address. Now a days, the most effective way to do what you are doing is... I'm sorry... a proxy. Using a proxy, as long as the primary computer is logged on using the username and password, the proxy hides the second computer with a non routable IP address. To the ISP the internet requests are coming from one computer. WinProxy is a good solution for this...

The final suggestion is to upgrade to an always on connection... DSL, Cable modem... and just lease another IP address from the ISP. The are usually about $5 extra.. The speed at which you connect and the convience of not taking up a phone line can't be beat...

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