If You are an Heir to a House do You need to have the Deed Changed?

I am trying to help out my grandmother. I just got 1 attorneys opinion today and he said since my grandmother was the only child to her mom and dad and when her mom died (about 10 yrs ago) her husband had already ped and she was the only child, so my grandmother was the only heir so she took over the estate. My gma doesn’t live in this house, she has her own, but she doesn’t want to sell it and she wants us grandkids to have it and keep it in the family. The attorney I talked to said that my gma can will it to anyone she wants because its hers, which its still in her moms name, but since she was the only child its technically hers and its hers to do whatever she wants with. Is this true?? Or do we need to officially get the deed changed into my grandmothers name, and how do I go about that? I’m getting all different answers!! Thx!!