Do all heirs have to agree before the Marietta home can be sold?

Generally, yes: heirs who inherit a Marietta home together as co-owners typically all need to agree to a sale, unless a will named an executor with authority to sell the property on the estate's behalf through probate. When heirs disagree, options usually include one heir buying out the others or, if that fails, a court-ordered partition action to force a resolution. An estate attorney should confirm which situation actually applies before the property gets listed.