On some level, yes: we can generally distinguish human faces from chimpanzee, gorilla, and other primate faces. In general, though, our facial recognition has

On some level, yes: we can generally distinguish human faces from chimpanzee, gorilla, and other primate faces. In general, though, our facial recognition has some quirks that make more fine-grained identification of relatedness hard. For example if I shave my beard it takes people a moment to recognize me, especially if I do not give them any clues. Also note that if we had a reliable way to identify degrees of relationship tribal marks would be far less common since tribal affinity could be detected automatically. In general ape facial recognition is oriented toward familiarity, not relatedness. This makes sense given the patterns of social behavior in apes -- fission/fusion social groups, individuals leaving their childhood group and joining a new group as adults, etc. It also makes sense given that establishing trust (or degrees of trust) is one of the primary functions of facial recognition, and people often betray the trust of their close relatives. Familiarity is also more general, since we are often familiar with our close relatives but can also be familiar with others, and the complexity of ape social groups requires a more general kind of recognition.