Final answer:
The statement that Indri live in small family groups consisting of a male, female, and their young is true, which reflects common social structures observed in several primate species.
Step-by-step explanation:
The Indri, which is a species of lemur, typically does live in small groups made up of a male, a female, and their young. This assertion is true. This family group structure is similar to that observed in other primate societies, although the specific social structures can vary greatly among different primates. For example, gorillas and chimpanzees tend to live in medium-sized family groups that include at least one dominant male, while orangutans are generally more solitary. In many primate societies, including that of the Indri, females play a crucial role in caring for the offspring and are central figures in the social group.