Do i need a real estate agent to give my son my house?

Yes. Have a Realtor or an Attorney.

It definitely would not hurt. However, I would recommend that you see a good attorney because this is more of a legal question. I do have a legal background, but I am not a practicing attorney now you need to make sure that all loose ends are tied up. I’m in California, and in California there are various ways to change title and potentially avoid probate. A trust is a good idea with a pour over Will. I do recommend at least a consultation with a real estate attorney, or an attorney, who specializes in trust and estates.

If you were selling the house to a family member then a Realtor would be helpful, but if you are "gifting" a property to a family member then you need the services of a real estate attorney.