Chris may be home in LA again, but he's not at an age where he's chomping at the bit to spend time with his dad. His social life is thriving and lively in a way Eddie's wasn't at that age-- or even at the age he is now. Eddie's social calendar is wide open and he's a bit lonely with Buck off apartment hunting, so when Chim and Maddie need help watching Jee Yun he practically trips over himself to volunteer. She's a dream to babysit-- easygoing, sweet, obsessed with tea parties.
Observant.
Jee Yun's his connection to Buck, she sees him more than Eddie has been lately. Maybe it's sad that he's getting his information from a four year old, but he's getting desperate.