All of Joey's sisters come to Joey's birthday party. Chandler ends up getting drunk and ends up making out with one of his sister's. The next morning, he cannot remember which sister. Joey is upset that he fooled around with one of his sister's but Chandler claims that he wantt to make a relationship out of it and that it wasn't just a one time thing. Joey then feels better and gives Chandler a hug.
Later, Chandler goes to Joey's grandmother's house where Mary alice lives to find out which one she is and explain things to her. However, Joey is there too doing his laundry. They all sit down to a meal and Joey hints around to find out which sister was the one he fooled around with. One of the sister's told him to excuse himself and meet her in the other room. They started kissing when he found out that this girl wasn't Mary Alice. Just then, Mary Alice walked in and caught them and called for Joey. Chandler explained that he didn't know which sister he fooled around with, and was sorry. Joey gave him one more chance. He had to apoligize to Mary Alice. When he looked around and couldn't find her, Joey told Cookie, another sister, to punch him.
This episode was pretty funny. Chandler sure put himself in a messy situation. The only way he got out of it was a black eye from a woman.