i guarantee you have never heard a thing more vile . my best friend 's husband cheated on her with his sister in law ! that is awful . i hope she has friends and family she can lean on during this tough time . she does but i imagine it 's going to be very hard for her . i would n't wish that on my worst enemy . i feel so bad for her .
Incestuous relationship between the husband and his sister-in-law.