S.D.
to add to the tittle, they have to go to the secretary of state's office. and they can do that there.
for the property title, contact the register of deeds office with the county he lives in They have copies of all property titles there. They can get you a copy of the title. It will probably cost a few dollars. Then he will have to go to a lawyer to do a change to add her onto it.
We had to add my name to all the properties and it was quite easy to do. When you speak to the lawyer, you may also want to look into the laws. If he passes away within so much time of making the changes you mom may still not get the items, when contested. The family can say she coerced him into doing it.