I have joint legal and physical custody of 2 children, but their dad has 51% and I have 49%. We live in alameda county in california. My ex-husband got a job promotion and moved to chicago and took my 16 yr old with him, without my permission, and now says he wont allow him to fly out to california and visit with me, and I offered, ofcouse to buy his plane ticket. He says he is afraid that I wont send him back. Needless to say, I'm upset, and I know my son is to. What should I do, with them living in ill and all?