If you have properties entitled "Joint Proprietors" and you are going to set up a will, could you do a codicil and have your partner sign it, stating that your half goes to your kids when you die, not into his assets?
Fern - If its joint then it bypasses the estate. So a codicil etc is of zero value. Its a good example of why putting clauses in your will to indicate where your super goes are useless. Super may not even touch the estate so a waste of ink - perhaps even invalidate the will if its poorly written too. Change for joint to TIC may be worth discussion with a lawyer AND also ensure the will deals with it. The kids interest could be better off as a testamentary interest and the partner may need a life tenancy interest too.
You could, but it would not be effective. A person can only do a codicil for their own will. You also have no control over then, they could change it a day later or after your death. They have have their will challanged by a child or former spouse or dependant etc. Change to TIC if you want to be sure. Or change titles to single names.