You have a few issues here. First you should move the court for child support. Second, as long as you are moving the court for child support you should also request the court amend the judgment so you can claim them on your taxes.
File a motion for child support with the court. In the motion, you will want both child support and to modify who may claim the dependent exemptions.
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The allocation of the child tax exemption(s) between the parties is viewed under Wisconsin Law as an issue of child support. File a motion to revise the support order (or to establish support if there is no prior order requiring montly child support to be paid) and request a different allocation of the child tax exemption(s). Speak to an experienced family law attorney in your area about moving forward. Hope this helps!
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