Take a Trip Down the Yellow Brick Road...You'll be Glad You Did
A true slice of Americana, this film expertly mixes fairytale with the reality of a loving family and home. (This is a good opener to teach kids about the loving potential of non-traditional families, since Dorothy lives with her uncle and aunt). Dorothy often takes on the "helpless damsel" role--somewhat justified in that she's supposed to be a little kid--but is generally kind, generous, and loyal to her friends. Those friends provide positive role models too, as they learn that what they wanted, they already had in spades, and can pass on to others.
Common sense would dictate knowing your youngest kids before popping this one in the DVD player. The witch can be scary, as can her minions (I remember being so creeped out by her deep-throated guards, my mom had to fast-forward that part). The Lion's intro scene could be a little disconcerting, too, as could the tornado. But I'd recommend introducing your whole family to Oz as soon as everyone is ready.
What other families should know
Great role models
Too much violence