What if you write the document in front of the notary and then add a statement at the end stating it was witnessed by the notary?

You do not need a Will for this. You and your son's mother can use a Declaration of Guardian for Our Minor Child. This must be notarized. If you write your own Will, you are likely to make a mistake in the writing or in how it is signed, witnessed and notarized with all the specific language required. You may qualify for free representation through Volunteer Legal Services or for low cost representation through the Modest Means program of Lawyer Referral Services. Note that a minor cannot inherit: you Will must provide that your house, etc. will be held in trust for him until he is of age (or later) with payments made for his health, education, maintenance and support.