Bequests may be argued at probate. Gifts made now are generally unchallengeble. Equally important, gifts can offer better tax reductions. Take a look at trusts. Legally, you are the trustee, and the trust or your beneficiaries are the owners.
Trusts are no longer just for the rich.
Check the legal sections of a large bookstore and you'll find several books on setting up trusts. Make cash and personal property accessible to your beneficiaries. In short, don't be one of the secretive types who leaves their spouse and children dead broke for two years. You need the right tax lawyer, though. They try to develop an expensive relationship when all you want is an affordable plan.