Every day around 2:00 in the afternoon, Holly gets up from whatever she's doing and goes to the front door. "Da-da?" she asks. "Da-da?" Andrew usually gets home somewhere around this time (give or take an hour or two), so I always tell her that Daddy's coming home soon.
Fast-forward to when Andrew comes home. Holly hears his keys in the front door and runs to watch as he comes in, a huge grin on her face. She tells him "hi," waves, and ignores him for the rest of the day.