We know from other reporting that these are all females, they are not all biologically related, and they both kept the mother company during the birth and worked together to keep the newborn afloat until it achieved its buoyancy. The newborn is the slightly darker whale being boosted to the surface:
Leah McElrath
Exceptionally rare sighting of a wild sperm whale birth.
Drone footage provided by Project CETI shows the first moments after the birth of a sperm whale in the Caribbean. Out of 93 species of whales, dolphins and porpoises, only nine have ever been observed giving birth in the wild
