There really is no easy way to get through the shunning, its unnatural when you really think of it. I'm sorry your having to deal with this in your life.
Many of us have experience in this and have had different outcomes. My only advise would be is to protect your heart and the heart of your child.
Just remember you have control over what you allow in your life. If what they are doing is hurting you, you need to stop and protect yourself. In my experience once I stopped letting them control my feelings and started moving on with my life they caught on and eventually came around, not to the point they use to be but enough that we can be at peace and love one another in a new way.
I wish you well.