With the params received on the client-side, you can store them into variables such as this.familys, with that you can then do the following.
PHP Code:
new GuiTextListCtrl("FamilyList")
{
profile = GuiBlueTextListProfile;
x = y = 0;
width = 230;
fitparentwidth = true;
clearrows();
// You need to use thiso. because you'll need to reference the weapon script
// and now the FamilyList object itself.
for (temp.i = 0; temp.i < thiso.familys.size(); temp.i++)
addrow(temp.i, thiso.familys[temp.i]);
setSelectedRow(0);
}