Tarzan told his wife and daughter that he'll teach them what life was like when his mother and maternal grandparents were alive. The daughter still never speaks until reaching twelve, but her two stuffed toys, the ones she loved the most, are already there from the time she was an infant.
He then had to tell the truth of what happened when his maternal grandparents lived and died long before he was even born. His maternal grandmother, the great Mongara, was basically a human discoverer of the mutant Garual, who was the result of a terrifyingly complicated experiment of a Mad Scientist on a feral, wild-born subject. Then, an unlucky romance resulted in her popping out a girl, whose name was Mamo. Mamo became one of the brightest women in the village of Mu.
The subject herself who popped out Garual, named Nuzan, was practically raised by apes and other animals since she was born within her highly disabled mother's post-mortem. She had to survive in the jungle by munching veggies, eating tons of insects and chewing off the fleshes and meats of fellow primates when available. She died when Garual was only close to two years old.