if she leaves the family home and the family with the intent of never returning, it is the basis for abandonment. if the car was purchased during the marriage, she has just as much right to it as you do.
while the home in trust is separate property, if it was acquired via an inheritance during the marriage or was in trust to you prior to the marriage you will need to show that which you should be able to do easily enough.
you may want to consult with a local family law attorney because you want to make sure that she is not able to wipe out any joint accounts you might have, etc.
and you will want to consider getting temporary custody of your son so that she does not come back and decide she wants him to be with her.
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