Download iOS 8 once and upgrade all iPhones at home, how?

Is it possible to download iOS8 only once and use it to upgrade all iPhones at home?  
I tried the following methods and they are just not working:
1. Connect an iPhone to the iTunes on Mac.  I chose Download Only. Once downloaded the iPhone Software Upgrade, I upgraded the connected iPhone to iOS8.  Then I connect another iPhone (used to be on another Mac) to the same iTunes.  I had to download iOS 8 again.  It's not using the same downloaded iOS 8 file.
2. I turned on the Caching Service (not Software Upgrade Service, i.e. for Mac Software) on the Mac Mini Server from the Server app.  I then repeat step 1 above and got the same result.  It seems that the Caching Service does not cache the iOS 8  Software Upgrade like what it does for other apps.  (I think I may need to use some Apple Scripts but I have no such experience.)

Ivan H wrote:
It's for the family.  Every member has 2-3 iOS devices to upgrade.
I agree with Csound on that, a family, even with a lot of devices will have to individually update.  There are enough nuances in the iOS for different devices that you need to download for each.  If you had 200 iPad 2's then there might be an enterprise way...but not a family with a mix of devices.

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