johnny althorp finally had his son and heir, little boy charles. >> once francis has given birth to the son and heir, she's fulfilled her contract. she has done what she was meant to do. >> she began to plot an escape route for herself. johnny could be violent, and she felt that she and her children would be safer out of the home. >> there were terrible arguments in the household. >> i remember seeing my father slap my mother across the face. and i was hiding behind the door and she was crying. >> in september 1967 that francis, diana's mother finally told her husband, johnny, that the marriage was over and she was leaving. >> and then to have your mother