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I don't know of any method by which you can avoid her coming back for increased child support, provided she still has custody or joint custody at the time. If you wish to give up your chance for future financial success, in return for never having assets or current income that would justify an increase in child support, you might simply gift your shares equally to your brother and father. Those shares would not be worth much now because it is a minority interest in a company that is not making much money, and pays no dividends. I hope that this is helpful and that you will enter a positive rating for me. Thanks for using Just Answer.