With the family pack of MM you can have up to 5 accounts each with its own email address (
myname@me.com ) , calenders etc...
My wife and I have the family pack and she has hers i have mine (emails) (mine is the master) with 20gb then 5 gb for each sub account.
We sync our calenders and contacts over the air from the iPhones to MM then MM syncs to out MacBook over the air or vise versa. I make a calendar setting on my MacBook on MM within seconds its on my phone too