I hesitate to post because I am pretty bad with technology.....
BUT check out
cozi. It is FREE and I recently put it on my i-phone so dh and I could share a calendar, to-do lists, and shopping lists.
Calendar - you can give everyone in your family a different color and color-code events.
T-do lists - You can great several different to-do lists and check them off from your phone. You can create a to-do list and then e-mail to someone in your family. The same applies for shopping lists.
You can set it up so that member's of your family receive an e-mail at the beginning of the week with that week's events.
Con - although you can add, check off, and delete events from a to-do or shopping list from your phone, you can not create a NEW list from your phone. You have to create the new list on the regular site (on the computer). I am not sure how this works with the i-pad.
Each e-mail address can only be on one account. So make sure only one person in the family actually does the signing up, putting everyone's e-mail address on the same family account with the same family password.