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It's incorrect to say that you can "add" your name to a deed. That's an ancient term that was used a long time ago when a physical piece of paper actually was passed around indicating ownership. These days a new deed is executed and signed by the owners of the property that would have the name "added" to it.
The "best" way would be a warranty deed, although a quitclaim deed would also work. Here's a link to a quitclaim deed: http://www.uslegalforms.com/mi/MI-02-78.htm
The "grantor" of the property would be the current owner, and the "grantee" would be the current owner AND the person to be added. As a 100% owner is transferring equally to himself and someone else, each person would own 50% (or if there were multiple people "added", each person would own an equal percentage).
After the deed is signed and notarized, the grantee can record it in the county deed records.
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