I am sorry that you are going through this difficult situation.
In answer to your question....ABSOLUTELY NOT!!!
Whatever happens between you and "their" Father, the children love both of you. They do not need to be burdened with adult stuff at their age.
Kids are smarter then you think and in time will figure things out on their own, but they do not to have their heads filled with any type of negativity about their parents.
Your job is to be supportive, regardless of how much you are hurting right now. Your children are the priority. Remember they too are trying to adapt to this new way of life.
Tell your family to butt out and to keep their mouths shut.
On a side note, it is also probably best that you stop sharing details with your family and friends.
Should your Husband return to earth again, it becomes a very awkward situation when so many people are involved.
There can be no testimony without a test. I am praying to go through this test and come out the other end with a new and better marriage then before.