I want to access my iCloud account (mail and calendar) on our family iPad. It is currently set up with my husband's iCloud acct. Can we have two accounts on this device?
You can set up multiple iCloud accounts, however, quoting iOS:
If you want to use mail and calendar only, there is no problem. You can even use all of the other services like contacts, reminders or notes.
Follow these steps to add another iCloud account:
(I took the screenshots on an iPhone, but it is smiliar to your iPad)