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 Knowing that his son cannot have children, his father-in-law helps his daughter-in-law become a mother
0 The couple lived together for 15 years without getting pregnant until their father-in-law came to live with them
0 Father-in-law fucks daughter-in-law when he sees that his son has a good wife and doesn't know how to enjoy it
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