0 The husband innocently did not know that his wife was having sex with her father and younger brother
0 The husband goes to work and doesn't know that his wife is at home having sex with her father and brother-in-law
0 The son goes on a business trip, the father stays home in the middle of the night and sneaks into the room to fuck his daughter-in-law
0 The husband was away, the daughter-in-law stayed at home and was fucked by her father until she became pregnant