Can I get a book off partners iPad sent to mine
I Downloaded a book on partners iPad cause I forgot my iPad can I get the book sent through to my pad iCloud
If it's an ibook, and you are using the same account then it should (if it's still in the store and you haven't moved countries) show in the Purchased tab in the iBooks app on your iPad for redownloading. If it's no longer in the store then you will need to go via your computer's iTunes to copy it from you partner's iPad (File > Devices > Transfer Purchases ; and if using an up-to-date Mac then do File > Move Books From iTunes in its iBooks app), and then sync it to your iPad.
If it came from a different source (e.g. an epub from a different site/store) then try going to that site/store on your website and redownload it.