ดิก เกรย์สัน & จัสติส ลีก

Nightwing is late to a meeting due to an exploding building. Batman goes to check him over, licking his thumb to clean his face. As Nightwing complains about it, they learn that no one realized that Batman is his dad.

All it takes is a kidnapping for 3 heroes to start noticing discrepancies when it comes to the Robin mantle being passed down.