Study the known facts...
What did Ralph do to prevent the children from being killed? He did little if anything, he had neither time nor opportunity to prevent any one of the eight bullets connected with the deaths of Daniel and Nicholas occurring - this suggests that Ralph was probably not present upstairs when the killer shot and killed them both So, where was he whilst his grand children were being unlawfully killed"
Similarly, his wife Junes death was a slow lingering death, she was shot no less than five times non fatally, whilst she lay sleeping in her bed. She managed to drag herself out of bed and moved around inside the bedroom, yet still Ralph did not come to rescue her, something had happened to Ralph which prevented two additional shots to the head, putting here out of her misery...