351. Where no time has been fixed for the payment of a general legacy, interest begins to run from expiration of one year from the testator's death. Exception.-(1) Where the legacy is bequeathed in satisfaction of a debt, interest runs from the death of the testator. (2) Where the testator was a parent or a more remote ancestor of the legatee, or has put himself in the place of a parent of the legatee, the legacy shall bear interest from the death of the testator. (3) Where a sum is bequeathed to a minor with a direction to pay for his maintenance out of it, interest is payable from the death of the testator.