My ex wife took my kids and moved from missouri to kansas without giving any kind of notice. we have joint custody but she has the primary custody. in

Sir, I practice family law in the St. Louis area.  There is a Missouri statute (Section 452.377) that requires notice of a proposed relocation of the residence of a child to any party entitled to custody of or visitation with that child. Relocation without notification to the other parent can have consequences which include, but are not limited to, a change of custody.  You should consult with an attorney in your area at your earliest opportunity to explore filing a Motion Objecting to Relocation of Child or other appropriate document in court contesting the relocation and/or modifying the parenting plan in light of the relocation.  The statute states that any party who objects in good faith to a relocation of a child shall not be ordered to pay the attorney fees of the relocating party.  Good luck!