I would tweak it just a bit to say the following. Others can chime in with their advice/comments --
W, I note that you have not responded to my repeated requests that we work out an amicable timesharing arrangement that allows us both to share time with our children equally. It is not good for our children that you to continue to stonewall on this issue. I will discuss the financial matters between us when we have a parenting agreement in place that provides for us to share time with the kids equally. The children need both of us in their lives on a meaningful basis.
