If you are truly concerned about your son's safety then you could bring it up with H. But really be aware of your motives for bringing it up. Is it due to concern for S or because you want to prove to H he is not parenting as you would?
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss