When 4 or 5, our daughter would beat my wife and me at Uno too. Funny! I think if you are a board gaming couple, you will be a family that plays too. Much more interesting than tv.
Munich is 2 territories away from Venice, so you wouldn’t be able to move in until Round 2. If you’re playing with the tournament rules, then that is allowed, and Germany would take control of the territory since they made the attack that killed the last defenders. You only have a choice when you have multiple defending powers that kill all the attacking units.