Adding a co-owner using a quit claim deed

[Mike]

How do you add someone's name to a title using a quit claim deed keeping the grantor's name on the title as well? My aunt is very ill and we need to sell her property in Florida in order to help pay for her nursing care, but we want to keep her name on the property until it sells due to the homestead tax credit she gets as a FLA resident. So we just want to add my dad's name to the deed in order to enable him authority to work with a realtor in FLA. (we live in Michigan). Thanks! Amy