Hello,
Thank you for explaining. I would recommend not to recycle posts by other Steemians, even if they are your family members. It could be seen as an attempt to spam and exploitation of Steemit's reward pool.
Right now, I could open 100 accounts and claim that they are members of my family and repost the same content on each blog trying to farm the rewards' pool.
I'm not saying that the other account isn't your son's, of course. I'm just trying to explain the point.