In our house we have two iPhones and an iPad. Each one has a separate iTunes account so we could have different versions of the games instead of sharing. We've upgraded our computer from a PC to a Mac and when trying to sync any of the iPhones or iPad, we get an error message that says that the particular item is synced to a different account. How do I sync the iPhones and iPad to the new computer without erasing all the information on the item?
IOS – Trouble syncing multiple Apple products between multiple computers
data synchronizationiositunesmac
Related Solutions
Home sharing should allow you to see each other's libraries over your home network, and drag apps from your wife's onto yours and vice versa. You can definitely do this despite having two accounts - my wife and I have a similar problem. You may have to enter both passwords from time to time to authorize purchases, though.
I found some help setting this up from "Activating Home Sharing in iTunes".
I believe you can also sort hers by "items I don't have" so you can see what she might have bought of interest to you, although I'm not sure you can automatically sync them.
This SuperUser question seems to suggest that merging two accounts is not an option:
Can I merge 2 iTunes Store accounts?
I tried many different approaches but none of them worked, had to erase & sync
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Best Answer
If you really want to sync between multiple computers, it is technically possible. You have to place your iTunes library folder in a location that can be accessed by all of the systems on the network. Then, when you want to access that shared library, hold down the Option key (Shift key on Windows) while iTunes is opening. This will bring up a dialog box with an option to select another library. Click it, and browse to the shared network folder with the iTunes library in it. iTunes will open with this library, and you should be able to sync your device on that computer.
The downside? Unless you have a server or network attached storage device, the computer that is actually hosting the iTunes library folder has to be running more or less all the time. Also, iTunes may not maintain all of its purchase authorizations between computers. If these things don't bother you, then this is definitely an option.