Have a husband and wife who share a cell phone. Can't put cell in for both

Concerning your question about how to add a couple who share email address and cell, you can use the 'proxy email' feature to to send all messages to the one address.
So for example, if the couple are John and Jane Smith with email address thesmiths@example.com, you can set up John with the main email address and setup Jane with an email address like Jane.Smith@noemail.gac.com or Jane.Smith@noemail.churchscheduling.com.
Once added, you can edit Jane's profile and enable proxy emailing their main email address.
Unfortunately, cell phones must also be unique and we don't currently have a way of having 2 people share a cell.