His would have to use his words very carefully to convince her. No, he should not suggest that Julie lead the police to his son because that would imply that Julie is lying about the "kidnapping" and that would also implicate her in an accusation that she knows where his son is. I doubt she would fall for that.
However, if he were to plead with her the "bury the hatchet" and join with him in searching for THEIR son, this would suggest (to her) that he believes her story and, as a result, might begin to warm her feeling toward him as the other parent. Get her to believe that he trust her. Share the tragedy together. Maybe, in conversation, suggest that he feels she is a good mother and he is sorry for all the conflict. Further suggest, when they find Sky, she should be the custodial parent and, in short, gain her trust.
All that being said, there is so much conflict and history between the two, I can't see her suddenly confiding in him, especially if she is responsible for a tragedy involving Sky. She would never tell him the truth.
The more I ponder on this, the more I don't believe that she would ever bite. Not from him. Maybe from another family member perhaps? Maybe the friend she called that day? Maybe one of the police detectives could play "good cop" with her? Maybe one already is? :winko:
If I thought it would help, it would be a great idea, but with their past history together, it's not likely she would buy it.
IMO, of course.