The Rugrats' Angelica is the only one who can talk to the babies because they are a figment of her imagination.

"She is spoiled, sad and lonely, because her mother is constantly working and has no time for her.

So how did it come about that Angelica would have to imagine these babies? Tommy died soon after child birth, a fact reflected by Stu never leaving the basement, inventing toys that his son will never play with. Chuckie died in the car crash along with his Mum, also reflected in the actions of his father; the crash has made him a pathetic nervous wreck most of the time.

Most interesting is Phil and Lil. There never where any twins, there was just one baby. However this baby was a still born, and Angelica never knew the sex of the still born, so she invented twins of different genders."