Been separated for almost a year now and ex has agreed to mediation to get a parenting agreement in place, but ONLY if my sister is also a party to the mediation. Even the mediator thinks it's really weird. She has no say in schooling, day to day care, medical matters etc which are the only matters really that will be discussed. And is of course going to support me entirely. For clarity, he's not asking her to go as a support person but as an actual party to the mediation.
Has this happened to anyone else? Any guesses as to what he's trying to achieve (other than the fee being split 3 ways instead of 2???!). Everything he's done since the split has been angry/spiteful so it's unlikely it's for a good reason, but would love any suggestions as I'm completely confused!