Deb & Tammy, Tammy
Relationship: Mother and daughter
Played by: Allison Janney and Melissa McCarthy
Age gap: 11 years
Crunching the numbers: The too-close-for-comfort casting of Janney, 54, and McCarthy, 43, is just one of the many age-inappropriate on-screen familial set-ups in Tammy. Susan Sarandon, who looks nowhere near her 67 years, plays Tammy's grandmother Pearl; 62-year-old Dan Aykroyd would be more suited to play Sarandon's husbandinstead, he plays McCarthy's father Don. And Gary Cole, 57, plays dad to 37-year-old Mark Duplass. When a 20-year age gap between supposed family members is your widest spread, you might have cast your film a bit too fast and loose.