5-year-old grandson in dog cage. "Mom says I must stay here for letting the dog escape..." 

Why would you tie up the dog when they had a backyard

Someone stole the dog when people see animals being mistreated they steal it

I think it is time to investigate your daughter in law, something wrong with her. When the child was lock up in the dog cage you should call the Police before you take out the child from the cage so that the P0lice can see it.