In Arizona, how does one add others to the title on a home?
(ie. A father adding children to his home title)

At the top of this forum is a sticky note which gives instructions.

You have to understand though, that adding anyone but a spouse to the title of a property is, in effect selling or giving part ownership in that property to that person. There are tax consequences of such an action.

What document is used to add others to a home title?

A deed. There is a sticky post at the top of the Real Estate Law forum that explains how to add someone to a deed. You can read it at https://www.askmehelpdesk.com/real-estate-law/how-add-someone-your-deed-91136.html

An entire new deed has to be prepared and filed to add someone.
Also if there is a mortgage on the property, you will need to notify them and be sure there is not an issue doing it

I merged your two threads. Please don't start multiple threads for the same issue.