Mother heard husband kill sons
Farm labourer Keith Young, 38, drove his sons Joshua, seven, Thomas, six, Callum, five and Daniel, three to a beauty spot near Llangollen, North Wales.
Mr Young, from Winsford, Cheshire, then gassed them by running a petrol lawnmower in the back of the family car. He was separated from his wife Samantha but was seeing the boys on an access visit.