When you recount how you and somebody else did something, it is culturally favored to put the other person first. For example:
Franz und ich sind einkaufen gegangen
is preferable over
Ich und Franz sind einkaufen gegangen
But does this rule also apply when talking about 2 people other than yourself, one of which you are adressing directly?
Franz und du seid einkaufen gegangen
compared to
Du und Franz seid einkaufen gegangen
or does it not make a difference in this case and nobody would care how you phrase it?
Edit
Perhaps this (slightly) longer example sounds better than the constructed ones above:
Du und Franz habt euch über die deutsche Sprache unterhalten, richtig?
Is the order of "Du" and "Franz" arbitrary in the above text or is there an inofficial rule how to order these two?