Take a look at the app "MailShot" (disclaimer: I have it). it's a great little app that will let you create groups that go right into your Contacts app. You can get the free version to try (it restricts you to only having five people in the group). If you like it, the Pro version is $3.99 (USD), but you can make groups of larger sizes (up to 50 people ... though it could be more).
I used MailShot to create a group of my family; it has 22 people in the group. Selecting one group to send out e-mails to all them? Priceless.
Just one idea...
Marilyn