How to play with my dad in the same house?

[McPuffin]

I live at home with my dad and I want to play this game with him like we used to way back in the day, but its saying my IP is blocked if he is on at the same time. This of course kind of defeats the entire purpose of us installing all this.

Is there any way to play with us both living in the same house to play at the same time?

One of the other threads on this said to PM Nilbog, but I don't see any way to PM anyone.