I've known other people who have forgotten their child. Once, a co-worker chatted with me in the grocery store parking lot, and her older children were fighting, so she quickly loaded them up in the car & drove them home. BUT she forgot the youngest, a toddler of 18mos., in the shopping cart!! We were yelling at her to stop, but she drove off & I couldn't chase after her because I had my own 2 girls to keep an eye on. My older daughter wheeled the shopping cart & I drove the little one home, sans carseat, since I didn't have an extra. My friend was flabbergasted - I caught up to her as she was pulling in her driveway. And her older girls were so busy fighting over Barbies that even they didn't notice the youngest was missing.
What a horrible burden for a parent to have to bear, esp. when a death occurs. I wonder if the man was just too tired, careless, mentally incompetent or drunk, or what? If only other family members had realized his mental condition and provided assistance in the childcare.