What are the names of Terry Jeffords' twin daughters?

Terry Jeffords' twin daughters are Cagney and Lacey.

Terry and Sharon Jeffords become parents before Brooklyn Nine-Nine begins, and their twin girls are repeatedly treated as an important part of Terry's life. Their names are a playful reference to the 1980s television police drama Cagney & Lacey, whose title characters were detectives Christine Cagney and Mary Beth Lacey.

The names are easy to confuse with Ava, Terry and Sharon's younger daughter. Ava is born later, after Sharon goes into labor at the precinct during the episode “Ding Dong.” Rosa and Amy are detectives in the Nine-Nine, not Terry's children, while Molly and Nora are not members of the Jeffords family.

Terry's devotion to his daughters also helps explain several of his character traits: he is protective, family-oriented, and determined to balance demanding police work with parenting. The girls' names therefore connect a small family detail to the show's broader love of police-TV references.