Can there be more than one apple id on a device?

Question

We have 4 iPhones, 1 Macbook Pro, and 2 iPad Mini's.  Currently my wife and I have separate Apple Id's which works great for our iPhones.  However, our 2 children now have iPhones and iPad Mini's and I don't want to have to purchase the same Apps and music 2,3, or even 4 times so that everybody in the family can use them.  I understand home sharing is designed to solve this problem however I am not clear as to how this works exactly. Obviously I don't want my children/wife to sync my info to their devices and vice versa.
So far we have two apple Id's [email protected] and WifeAppleId.mail.com.  My children will need their own apple id's as well so that they can use iMessage on their phones and also to keep their stuff separate when syncing.  Therefore I would create [email protected] and [email protected] Now everybody's iPhone will have their own apple id and sync independently of one another.  Obviously each person would have their own account on the family Macbook Pro for syncing their devices with iTunes.
In order to share apps and music (at least knew apps/music) I now need to enable Home Sharing.  This is the part I'm a bit confused about. 
Do I create a fifth apple id say [email protected] and use this to configure home sharing on the Macbook Pro? 
Do I configure Home Sharing for each user account on the family computer?
Now everybody will need to have two apple id's on each of their devices, for example MyAppleId and FamilyAppliId will need to be configured on my iPhone, WifeAppleId and FamilyAppleId will need to be configured on my wife's phone, SonAppleId and FamilyAppleId will need to be configured on my son's iPhone and iPad Mini, and the same for my daughter.
How do I associate two apple id's with each device?  How do I sync a device with two apple id's?
I'm hoping someone can answer this question as clearly as possible

Answer 1

I will share with you what I have done to manage this with my family.  While the solution isn't without flawes, it seems to do the trick.  First, you need to have one person who is managing the synching of everyone's devices.  In my family, I have three iphones, about to be four, and five ipads.  We all synch to the same apple ID to allow one another to take seemless advantage of our Itunes, which is on our Imac.  To synch individual music or video interests, we simply select which playlists we want and manually synch that way.  A couple of us use imatch and the cloud to make the entire library accessable as well.  With respect to the imessage, mail, contacts, etc. we each have a gmail account for our individual emails, contacts etc.  So for instance, my forth grade daughter has a gmail account that we choose to synch her contacts, calendar, etc to and then that is also the account where she receives her imessages from on her ipad and itouch. My son, who has an iphone and ipad, does the same thing, but under settings, he goes to imessage and checks his phone number and his email as his preferred way to receive imessages and texts.  My wife and I do the same thing.  To avoid having everyone see one anothers contracts etc, we only synch contacts from our individual email accounts.  Here is the downfall to this:  When you update your phone or add a new device, apple always wants to reset everyone's facetime and imessage settings and then low and behold we are all receiving imessages from one another's friends etc.  To work around this, I simply take each of their devices and go to their imessage settings and only check the email and phone numbers relative to their devices.  I dont' know is this is the best solution, but it seems to work for us.