TomS,
In the history of the Church from the earliest days up until now, "sister chuch" has always been used in one and only one way: To mean two local churches of the same Body of Christ. You can read all of the saints and this is the meaning. "Sisiter Church" is never used to describe a heretic body which is completly foreign to the Body of Christ - who is the Truth.
Clearly nothing has changed, even for your heirarchs it still means the same thing as it always has does it not?
So now that we've established that the only difference between your faith and the Latins, between your church and the popes, is a simple matter of human sin, and that all that needs to be done is the simple establishment of formal communion, the last set mile connecting the Union Pacific railroad so-to-speak. What else is their to discuss?