As far as the Pirahã have related to researchers, their culture is concerned solely with matters that fall within direct personal experience, and thus there is no history beyond living memory. Pirahãs have a simple kinship system that includes baíxi (parent, grandparent, or elder), xahaigí (sibling, male or female), hoagí or hoísai (son), kai (daughter), and piihí (stepchild, favorite child, child with at least one deceased parent, and more).[4]

Daniel Everett states that one of the strongest Pirahã values is no coercion; you simply don't tell other people what to do.[5] There appears to be no social hierarchy; the Pirahã have no formal leaders. Their social system can thus be labeled as primitive communism, in common with many other hunter-gatherer bands in the world, although rare in the Amazon because of a history of agriculture before Western contact (see history of the Amazon).

Their culture is remarkably conservative. For example, they use canoes every day for fishing and for crossing the river that they live beside. However, when their canoes wear out, they simply use pieces of bark as temporary canoes. Everett brought in a master builder who taught and supervised the Pirahã in making a canoe, so that they could make their own. But when they needed another canoe, they said that "Pirahã do not make canoes" and told Everett he should buy them a canoe. The Piraha rely on neighboring tribes' canoe work, and use those canoes for themselves.[5]

Pirahã build simple huts where they keep a few pots, pans, knives, and machetes. They make only scraping implements (for making arrowheads), loosely woven palm-leaf bags, bows, and arrows.[3] They take naps of 15 minutes to, at the most, two hours throughout the day and night, and rarely sleep through the night.[6]

http://en.wikipedia.org/wiki/Pirah%C3%A3_people