As a single mother, how do I deal with my ex-husband over the children without repeated conflict?

Keep every dealing with your ex-husband focused on the children's needs only, not old wounds between the two of you. Limit conversations to important matters such as the visiting schedule and the children's schooling and health, and use a brief, polite tone. Set a clear way of communicating so there are no misunderstandings, and avoid making the children carry messages. Do not argue in front of the children even if you are right. For disputed custody, maintenance or visits, refer to the Syariah Court or a sulh officer. If dealing with him is a source of repeated, draining conflict, let a sulh officer or a trusted go-between handle the communication. See counselling.