▁including ▁respons ib ilities ▁for ▁ceremony ▁and ▁marriage ▁rules . ▁People ▁are ▁introduced ▁to ▁children ▁in ▁terms ▁of ▁their ▁relation ▁to ▁the ▁child ▁(" grand m other ", ▁" un cle ", ▁etc ), ▁introdu cing ▁the ▁child ▁to ▁kin ship ▁from ▁the ▁beginning . ▁ ▁Y ol ŋ u ▁soci eties ▁are ▁generally ▁described ▁in ▁terms ▁of ▁a ▁division ▁of ▁two ▁ex og am ous ▁patr imo iet ies : ▁D hu wa ▁and ▁Y ir rit ja . ▁Each ▁of ▁these ▁is ▁represented ▁by ▁people ▁of ▁a ▁number ▁of ▁different ▁groups , ▁each ▁of ▁which ▁have ▁their ▁own ▁lands , ▁languages , ▁to tem s ▁and ▁philosoph ies . ▁ ▁A ▁Y ir rit ja ▁person ▁must ▁always ▁marry ▁a ▁D hu wa ▁person ▁( and ▁vice ▁vers a ). ▁Children ▁take ▁their ▁father ' s ▁mo iety , ▁meaning ▁that ▁if ▁a ▁man ▁or ▁woman ▁is ▁D hu wa , ▁their ▁mother ▁will ▁be ▁Y ir rit ja ▁( and ▁vice ▁vers a ). ▁ ▁Kin ship ▁relations ▁are ▁also ▁mapped ▁onto ▁the ▁lands ▁owned ▁by ▁the ▁Y ol ŋ u ▁through ▁their ▁her edit ary ▁est ates ▁– ▁so ▁almost ▁everything ▁is ▁either ▁Y ir rit ja ▁or ▁D hu wa ▁– ▁every ▁fish , ▁stone , ▁river , ▁etc ., ▁belongs ▁to ▁one ▁or ▁the ▁other ▁mo iety . ▁For ▁example , ▁Y ir rit ja ▁y i ḏ aki ▁( did ger ido os ) ▁are ▁shorter ▁and ▁higher - p itch ed ▁than ▁D hu wa