@CoParent_Marcus — With true 50/50 custody in California, neither parent has a presumptive right to relocate with the children. The LaMusga and Burgess framework applies, and the court will evaluate the best interests of the children. Your strongest arguments: (1) 50/50 custody demonstrates that both parents are equally involved — disrupting this harms the children's relationship with you, (2) school-age children have established community ties, friendships, and extracurricular activities, (3) 'flying down every other weekend' is not a workable plan for maintaining a meaningful parental relationship, (4) the motivation for the move (remarriage) is personal to the parent, not primarily beneficial to the children. File a motion to prevent relocation immediately. The court may issue temporary orders preserving the status quo while the matter is litigated. Move quickly — if she relocates before you file, it becomes harder (but not impossible) to reverse.