One solution is a trust in your beneficiary(s) name, where you sign everything over to your beneficiary(s) but retain control while you are alive, and can kick them off the trust simply by buying it back for a dollar.
Takes a good lawyer to set it up though, and the more children you have the harder it gets.
If the trust settlor retains lifetime control without a dicernable standard for distribution to the beneficiary, or if the trust is otherwise revocable (and the right to buy it back for less than FMV is treated as a right of revocation) the trust corpus remains a part of his estate.