I googled "adding a minor child to a deed" and among the many results saying it was a bad idea, I found this:
"Get an experienced real estate attorney involved as well as an estate planner. What she is considering doing is potentially disastrous.
Consider the following:
1. As a minor, the child is not able to enter into real estate transactions and therefore the property may not be sold until the child is 18.
2. If the child wants to go to college, then the financial aid office will look at that percentage ownership in the paid off house as the child's asset and will weigh it much greater than if it were the grandparent's asset alone.
3. If the child is ever involved in a lawsuit, say for a car accident when they are 16, then leins could be put on the house and it can potentially be lost.
4. Depending on how the property is titled, then the other children will not be able to argue ownership of the whole property. But they can argue over the 1/2 ownership that your mother retained. "