It is hard to change the personal, sometimes too personal, communication with someone with whom you had a prior romantic relationship to a more professional and businesslike tone after the break up/divorce. You are no longer a couple, you are now partners and your business is your child(ren). Communication is key, but it must be productive communication, like you use at work with your business colleagues. Sometimes knowing that what you send in a text message can’t be altered, holds the parents accountable and can prevent abusive language. One app even has a “tone meter.” There are many co-parenting apps that help with communication. Below are options, but there are more:
https://www.ourfamilywizard.com
https://talkingparents.com/home
https://www.ourfamilywizard.com/…/parents…/tonemeter