WHO IS AT FAULT ？

A man returned from work at night and heads straight to the bedroom to make love to his wife.

When done, he went straight to the kitchen to fetch himself a bottle of cold drink, only to find his wife there looking for something in the fridge. He asked his wife how she quickly made it to the kitchen, when they've just finished making love.

His wife screamed: "Aahh! That was my sister in the bedroom, she was so tired when she arrived, so I let her sleep in our room".

Alarmed, she ran to her sister and asked her why she didn't say anything, when her husband was making love to her.

Sister replied: "you know say, me and your husband no dey talk.
????????????????

Who is at fault here???
1. The wife who allowed her sister into her matrimonial bed
2. A husband who couldn't differentiate between wife and sister inlaw.
3. A sister inlaw who couldn't stop brother in-law from having sex with her..........
NO SENTIMENT!