0 The father became sexually attracted to his daughter because she looked too much like his late wife
0 The husband innocently did not know that his wife was having sex with her father and younger brother
0 The younger brother took the risk of raping his sister-in-law because the older brother wouldn't lend her money
0 The father was away on a business trip, the son stayed home and fucked his stepmother for 3 days and 3 nights
0 Father-in-law helps his daughter-in-law satisfy himself when he learns that his son has premature ejaculation