Dean
I know you directed that post to Lucifer, but I thought I'd pop on over to let you know it was me, sugar.
Sorry about that! It was just that his mind was subconsciously praying for things to be simpler, easier, uncomplicated. So I kinda went with it and put him back into the body where he was most comfortable. As a baby. It was the easiest, simplest time in his life, when he still had Mary and John and you.
Don't tell him your parents are gone. He'll probably still understand, even at this age. His memories will return when he ages back up. And that will happen only when he's ready. Subconsciously, it's his choice.