It's so sad that little LH's last days of life were filled with fear, sadness and pain. I tell ya, all this really eats at me. Bruises also take time to heal on the surface. I don't buy that in three years, JH didn't come home at least once, and see LH with a bruise or two.
I'm not trying to excuse JH, just contemplate a way some of that might have gone.
Say JH comes home and Lucas has a bruise. Maybe EG has already told JH her version of how it happened. JH sees little Lucas and says "hey, little man, that looks painful?" Lucas says yes, or maybe that it's not so bad now, he's happy that his dad's finally home. JH might say, "so I heard you fell off the swing at the play park, oh dear you must be more careful" and maybe Lucas gives a sideways look at EG who's standing nearby and EG breaks into the conversation, "Hey, JH, I got your favorite cookies, shall we all have a cookie? Would you like a cookie Lucas? Lucas why don't you go eat your cookie in the kitchen while your dad and I catch up"