G.R.
I have a four year old daughter that has been to seven funerals in her little life. SHe has dealt with each one in their own way. We simply explain what has happened and she understands. Also even though he is seven take him something to do. Like a book or game that has headphones. SOmething that can keep him still for atleast an hour. You need to be there to support your husband and your child needs to be there to understand that death happens to everyone. This may have him asking you alot of questions so be prepared for that. I think it will be a great learning experince. It has been for my daughter.