We are at WDWwith our grandson and ex- daughter-in-law. Long story short, she and my son are divorced but she and DGS live with DH and I. Her grandmother who is in a nursing home has been taken to the hospital non responsive. Her grandmother fell about two months ago, suffered a blood clot on the brain and had successful surgery. She is 90. We are all suppose to cruise on the Dream on Thursday. Now, ex daughter-in-law has sole custody. Can I get a letter from Disney, have her sign it, get it notarized and take him with us without my sons signature? She brought her divorce and custody papers with her. I booked our return flights on Southwest using points, so I can fly her home without penalty. I did get insurance on the cruise but will they reimburse under these circumstances? Thanks and please tell me what I need to do.