Q: Controlling photos on iMac and iPads

If you sync your photos to your iPad using iTunes Photo Sync, you can select different albums to sync to the two iPads, see: Sync photos to your iPhone, iPad, and iPod touch in iTunes - Apple Support

iTunes Photo Sync is not available, if you are using iCloud Photo Library on your iPhone. If you want to use iCloud Photo Library, each of you would need to set up a different Photos Library to sync with iCloud for your own AppleID.