1. What's the name of the real estate license?

If the real estate license is your grandfather's name, this house is their married property.

Then, when your grandfather died, 50% of his property rights in this house were inherited by your grandmother and their two sons.

So, now this house should be: 50% of your grandmother's own+one third of your grandfather's 50%.

Their two sons, each accounting for 50% of a third.

This room is now owned by three people. Your grandmother has no right to give you all the property rights of this house!

You can't give this house to you until the three of them agree, so grandma's two sons must agree.

As for the specific operation method of donation, I won't elaborate.