My current email address is one of four on our family sharing. I need to set up my own Apple ID for my new computer, but I would like to use my email address (my husband has the main email address for our family sharing account). Can I do this?

If the email is indeed an alias and you would like to be safe and remove it before creating your own AppleID, you can do so by logging in (as him) into iCloud.com and do the following:

Change, turn off, turn on, or delete an alias

1. Click the Action pop-up menu in the sidebar, then choose Preferences.
2. Click Accounts.
3. Select the alias in the Addresses list, then do any of the following:
4. Turn off an alias: Select “Disable alias.”
5. Delete an alias: Click Delete.
6. Click Done.

Yes.