zhang heng must be a little salty... they have one child and completely abandon it and leave it to be raised by others, then have another and completely raise it themselves
Something deeper is going on. Telling him they are planning to have another child and raise it themselves just BEFORE leaving the airport?
It's like they are trying to distance Zhang Heng from them.
Massive age difference between siblings in China always weird me out. Yes, I know back in medieval times when people had a ton of kids, there was also a huge age gap between the oldest and youngest.