Tongan
A descendant of seafaring Polynesians that once ruled Polynesia from Samoa to the North, (Tonga is the term for 'south' which is why the country is named as such, being the southernmost part of the Polynesian Kingdom), Fiji to the West, and Marquesas to the East. Because Tongans loved (and still do today) the physical and mental challenge of overtaking others' lands and property, they sought and overcame much through war and wit. Today many Tongans are proud of the fact that their island home has never been overtaken or ruled by a foreign entity. (Every other land in Polynesia was eventually overtaken by foreigners although it might not have been so if the Tongans had remained in power.) Tonga remains Polynesia's lone monarchy. It has at its roots thousands of years of rule by chiefs and kings of Tongan heritage. 
Son: Those Tongans are some big boys.
Dad: The smaller one's ancestors were killed off in war and illness over the centuries, and because there was never an influx of new, smaller, foreigners the people have remained overwhelmingly big, strong, and smart. 
Son: That makes sense.