Mediation questions

Right.....I am the resident parent of our two boys and myself and my ex are due in court this week for our first hearing. She has refused mediation in the past, ignored solicitors requests for confirmation on contact, has constantly made me chase her for maintenance and now has failed to answer a request from cafcass for an interview. All of a sudden today she has spoken to my eldest son, she has told him she is going to speak to cafcass all be it late and that she will talk to me in court, i presume via a mediator of some sort. My children have asked me if i can get her to clear up some burning questions they have about her behaviour and constant lack of communication towards the boys. They are 14 and 12 and have not seen her since October and had not spoken since Christmas, this is because of the way she is being. The boys have point blank refused to see her and have said they will continue to do so unless she answers their questions. Regardless of what myself and my ex can agree on the boys are at the age where they can make up their own minds regarding seeing her so mediation for me and her would be of little use but it may be beneficial for the children and her. Can i ask questions on behalf of the children as without these answers i belive that their relationship will not get any better and it is deteriorating at a pretty rapid pace.