I have been divorced for 6 years. My ex-husband and I have shared physical custody of our two children, girls, ages 15 and 11. This has worked fairly well over the past years, but the 15 year-old has decided she wants to live with me only and visit her father on the weekends. What about the 11 year-old, if she wants to keep things the way they are? Is my 15-year-old old enough to tell the court this is what she wants, without much a battle from my ex, (Who will fight) and currently there is no child support from either of us, so will he have to pay child support for her then?