A second kindle device in the family questions

Hi;
My wife has a new kindle device. I have used mine for years.
I use eCalibre to manage my books to upload to my device, delete from my kindle after read, maintain it in ecal, etc.

How do I add her device to the same eCalibre program so that I can keep a separate view of what books I have uploaded to her new device from the current ecal library, when I upload books to ecal only for her to read to have those show in her library, when after she reads a book and deletes it from her device but have it shown as read in her library, and be able to export/backup her library separate from mine?

Thank you in advance for your help in accomplishing these items.

I update eCalibre as they are available.

I usb from computer (windows) to the device.

Thank you.