AP4 (back) and AP8 (front).
Are they sisters? Mother and daughter? Aunt and niece? It’s hard to know. Both are adult females and AP4 has a calf of her own (who is hiding behind her mother in this photo). I have suspicions that AP8 may be the matriarch of AP pod; she does not have any young calves but does usually travel with adult males—AP11 is particularly close to her and is probably her son. Her movements also appear to dictate the movements of the other whales. If she makes a sudden turn, the others usually follow.