It should go without saying that the moderation do not implement such rules to punish people, and yet once again we have to re-iterate the point.
As everyone knows families were once allowed to share networks to have separate nations, however this was abused by cheaters. There is now no way to tell the difference between someone with two nations and two family members having their own nations aside from you telling us thats the case, and frankly some people have been known to lie.
I assure you this issue does not need to be highlighted to Admin. He is well aware of the structure of the game, and if it were possible to allow family to play without allowing cheaters to prosper he would do it.
As for your options, your only choice is for one of you to find a network outside of your house.