Q: We have 3 ipads and I want to combine everything onto just 1 (and get rid of the other 2).  Is this possible??

I have never attempted this before, but I will share my thoughts. It believe it will depend on multiple factors. One, are they all one the same iTunes account? Two, it will depend on how much storage space you are using between the 3 iPads and how much storage is on the 3rd iPad. The only way I can think of to combine three iPads is follows. First, make sure all your purchases are transferred to your library from the two older iPads. Then, manually add the items you want to your ipad air.  There isn't a way to merge backups though, so this may not be what you are looking for. See these links for some more info: iTunes 11 for Mac: Download previous purchases from the iTunes Store  and Download your past purchases - Apple Support and Redownload or transfer your iTunes Store purchases from an iPhone, iPad or iPod to a computer - Apple Support

Hi

Are both ipads using the same apple ID if they are backup to iCloud

Any items can be downloaded again with the same apple ID .

The ipads you are selling turn off find my iPad

Then restore to factory settings .

Cheers

Brian