Does your grandmother own the house outright with no mortgages???

If so she would do a QUIT CLAIM deed in your names and then you would own the property.

If there is a mortgage on it the QUIT CLAIM title would be in your names subject to any senior liens (morgtgages,tax liens,judgements,etc.)

Your first home you are selling now most likley has the homestead exemption on it.

As far a purchasing the home it depends on what your debt ratio is. For instance some people would qualify to own 2 mortgages. You also could rent out the home in Marietta that didn't sell and count that towards your debt ratio income to purchase the property in Savannah.If values have dropped and you can't selll the house it might be better to rent until the market returns to a price you can sell it at.

You need to talk to a mortgage broker for options.

no legal advice