A mere violation of visitation terms will not excuse the noncustodial parent’s obligation to pay child support; however, active and extreme interference with his relationship with the children by the custodial parent may establish a substantial change in circumstance that warrants modification of the noncustodial parent’s obligation.
http://www.state.il.us/court/Opinions/AppellateCourt/2013/1stDistrict/1130818.pdf
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Laura Morgan is a Family Law Consultant. Laura is available for consultation, brief writing and research on family law issues throughout the country. She can be reached through her website. www.famlawconsult.com