Hourly vs. Contingency: How Family Law Attorneys Get Paid in Oklahoma Tulsa child support attorney James Wirth explains that while most family law matters must be billed hourly or on a flat-fee basis because contingency fees are ethically prohibited in Oklahoma, there is one notable exception: attorneys are ethically allowed to take a contingency fee when collecting past-due child support (arrearages), meaning the lawyer takes a percentage of the amount recovered. Watch more of these legal video