Lois' younger sister, Susan, pays the family a visit and brings with her expensive gifts for the boys, biting remarks for Lois and a cold shoulder for Hal – whom she has never forgiven for dumping her for Lois. Lois and Susan's competitive relationship takes a turn for the worse when Susan gives Malcolm and Reese her prize '65 Mustang convertible. But when Lois discovers that Susan needs a kidney transplant, she puts her anger aside and offers to donate her kidney to Susan, which Susan only sees as the perfect opportunity for Lois to one-up her.
| Title | Lois's Sister |
|---|---|
| Genres | Comedy |
| Release Date | 2004-02-22 |
| Episode Runtime | 00 Hours 22 Minutes |
| Season Number | 5 |
| Episode Number | 13 |
| Production Companies | Fox Television Studios, Regency Television, 20th Century Fox Television |
