In Florida a devise in favor of a beneficiary who predeceases the testator will fail unless there is clear intent or in certain relationships.
Under Florida Statute 732.603 a devise to a grandparent or a descendant of a grandparent of the testator does not lapse but would be distributed per stirpes UNLESS the testator gift is conditioned on the person surviving the testator or the testator provides for a substituted or alternative beneficiary.
A similar result is achieved when the decedent dies intestate (without a will). We often see complicated property distributions when a parent dies and one or more of their children predeceased the parent. In these cases, it is not uncommon to see the Florida homestead or other real property owned by representatives of multiple generations.