So what accident are you thinking that would make a parent react by covering up, rather than seeking help straight away? As I said earlier, if you want to be dishonest you can save yourself a lot of bother by claiming the accident happened after you got out of the shower. What’s the worst that could happen to you?
Why would you want to claim it happened after you got out of the shower?
In my hypothetical scenario the child is dead remember.
As for wanting a motive not to call the emergency services, I'll give you another hypothetical scenario. What if the parent(s) had given a child oral phenergan at bedtime and then jumped in the shower. The child got out of bed and somewhat drowsy fell from the back of a sofa or nearby windowsill. The child is knocked unconscious and the airway is obstructed. Complete airway obstruction leads to asphyxia (hypoxia plus hypercarbia) and cardiac arrest within five to ten minutes. The parent wants to hide the fact that their administration of phenergan may well be seen as a contributory factor at autopsy. In this scenario you would have a motive to cover up the death.