You can have the primary account and up to 6 secondary accounts. One of you is the primary. If your husband has an account it is a secondary if you are the primary. The primary is whoever is paying the bill.
Does my husband have his own e-mail. We are smithcr, (Cynthia and Robert on account.
Just adding to Latoque's excellent answer.....
Just from what you've said, no, he does not have his own email address. It looks as though there is only one email address, but you can create more email accounts as Latoque said. You will just need to sign out of one and then sign in to the other in order to access each email Inbox.
smithcr3688 wrote: Does my husband have his own e-mail. ...
You can check your UserIDs on your home Internet with the Lookup tool at https://idm.xfinity.com/myaccount/lookup. After you enter the requested information you'll see a list of the UserIDs on your account.