At what age can children decide which parent they want to live with? There is no magic age. Once children are close to teen years their opinion may be considered but the court will consider many other factors. Your attorney should not speak with your children about this but can go to court and get a Guardian ad Litem (an attorney for the children) appointed for them, who will be able to meet with the children and find out their preferences.
If you have other questions about Family Law in Missouri, or need representation on a family law matter, please contact Barbara Graham at The Law Office of Barbara Graham at 314-725-7600 or firstname.lastname@example.org