My ex and I share children, so I do everything I can to get along with him...sometimes we take the kids to a movie or out to dinner together. I think it's healthy for the kids to see even though we have our differences, we can sent them aside and act like grown ups. What ever the situation is, having a healthy relationship with someone who was once important in your life is usually a good thing. Sometimes on the other hand, we need to let those who are toxic and cause us hardship go, guess that's for you to decide. Good luck