Lily was born in Vietnam, and soon after her birth, she was given up for adoption.
Mitchell originally wanted to wait to tell the extended family that they had adopted a daughter. However, when she was introduced, the family welcomed her with open arms. She is, at times, doing activities with both of her fathers, but remains with Cam at home while Mitchell works.
Cameron often dresses her up as celebrities, such as Diana Ross, Madonna, and Ray Charles for the purpose of taking photographs. Cameron and Mitchell are currently practicing the Ferber method on Lily but Cameron can't always resist catering to her during the night, sometimes even watching movies such as Scarface, which Cam claims she likes possibly because of the bright colors, particularly the club shooting scene.
Another noticeable thing about Lily is that in most episodes she appears in she is seen with "Doggy," her stuffed dog, which appears to be a Labrador.
Mishaps with LilyEdit
There have been several occasions in which unplanned incidents have involved Lily. These are pretty much always accidents at the hands of Mitchell and Cameron.
Run for Your WifeEdit
Cameron had finally convinced Mitchell to dance with Lily. Of course, Mitchell accidentally hits Lily's head on a door jamb when he throws her up in the air. After quite a bit of fussing, more by her fathers than by herself, Mitchell and Cam finally decide to take her into the doctor. It turned out Lily was fine, but it wasn't long before the next little incident occurred.
Planes, Trains and CarsEdit
In the episode, Trains, Plains and Cars, Mitchell and Cameron lose Lily's favorite stuffed bunny on the subway. She keeps Mitchell and Cameron up all night and they try to tell her that her bunny went to a magical land and to sleep with a different stuffed animal. That doesn't work either.