Hello C.,
It seems as if I can relate to all of the divorce questions in the world. I have been through so much with my divorce and child custody ordeal.
I was in the middle for years. My children would report to me like I was the referee or something. I got to the point where I had to throw up my hands and tell everyone that they would have to deal with life's situations. Life doesn't always deal you a good hand.
I use to have to call and tell the teachers to give me two copies of everything that they handed out. He would not be responsible enough to follow through on anything. You won't believe this, but my ex did not go to a few of his sons' graduations. He will have to deal with those issues when they approach him, later in life.
You can not be the middle woman. Your ex will never take responsibility if he knows that you will be there to remind him of every important event. You will have to allow him to grow up and take interest in his children's lives. The children will be hurt at some of his actions and they will understand when all is said and done. Start excluding him from events that he doesn't need to attend. Tell his parents and let them relay the message. Ask the grandparents to help you as well. What difference does it make if they are with you or him? Use e-mails and leave it alone. You can document your actions that way, if it comes down to the fact that he says that he did not know about the event. Also, tell your ex that you need a clothing fund. Start a savings account for the extra things the children needs, with the child support money.
My children now just take things in stride and they are resilient to the disappointments they have encountered. They just say that they know how their dad is and leave it at that. I still feel that they come to me for everything that they need. I just tell them that they have to start asking their father. I am spread too thin and I can not supply them with everything on a silver platter like I tried to do out of guilt and out of wanting them to have what I did not have as a child. They eventually got the concept of working for what they wanted. I supply what they need.
You don't want to see them hurt. We need to allow them to experience all aspects of life. They will grow from these difficult time and know how to handle the feelings if they arise again.
You can never stop being supportive of their desires(unless they are detrimental to their well being). You should just do your part on whatever you can control. Your children will never say that you were not there for them. That will reflect on their father.
They will get to the point where they are not going to want anything but the car keys.
Be patient and breathe deep. Sometimes I would appologize to my boys for having a father like they have. They are not to blame for our dicisions.
Peace to you and yours,
D.