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Dear JACUSTOMER - His children are not entitled to any share of the inheritance however if the inheritance causes an increase in his income then you can file a motion for an increase in child support. The support is based on the respective incomes of the parents and not their assets so he would not have to pay any portion of the actual inheritance to his children or you in the way of support.
If he invests the inheritance and it results in a significant increase in his income then you can file a motion to amend the support.