Can I leave half of my estate to one son out right and put the other half in a trust for my other son?
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Yes, you can add a testamentary trust to your will and provide that Son A gets his inheritance outright but Son B's share will be put in a trust and the income and principal doled out t him by the trustee as specified in the terms.
Please do not try to do this yourself by using forms from the internet which may or may not be what you need. Many of these are incorrect or designed for particular simple estates and what you propose takes you out of the realm of a simple estate.
Yes. One half now would be a present gift for which you may have to file a gift tax return, and the other half will be placed in a trust with its own terms. Consult an estate planning lawyer. Good luck.