Office 365 Personal is purposed for the individual user. Subscription allows installation for one PC or Mac, and one tablet. Package covers full installed Office applications, online versions of Office, 7 GB of free online storage and 20 GB extra storage for one user, 60 world minutes calling per month on Skype.
For a family of five, we recommend you Office 365 Home. It offers installation for 5 PCs or Macs, and 5 tablets, with 20 GB of extra storage for each user.
Beside that, you can use it on your iPhone or iPad.
Click on the product name if you want to buy a subscription.