Any Tuck-In created by a loved one, using your Tuck-In invite link, will be visible on all Rest 2nd gen and Rest+ 2nd gen devices you have on your account. The Tuck-In is connected to your account, and not to a specific device.
If you share a Rest 2nd gen or Rest+ 2nd gen with a caregiver/spouse, they will be able to see the Tuck-In when connected to the Rest 2nd gen or Rest+ 2nd gen that you share.