How do I add my son to my deed?

How old is he?

At the top of the Real Estate Law Forum there is a sticky post 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-569716.html

This should be considered very carefully as there could be legal and/or tax ramifications.

This should be considered very carefully as there could be legal and/or tax ramifications.
It already says that in the sticky.