▁get ▁access ▁to ▁the ▁el dest ▁brother ' s ▁wife . ▁For ▁families ▁with ▁more ▁than ▁seven ▁brothers , ▁the ▁e ighth ▁brother ▁will ▁marry ▁a ▁new ▁b ride . ▁younger ▁brothers ▁get ▁access ▁to ▁the ▁e ighth ▁brothers ▁wife , ▁but ▁not ▁the ▁elder ▁brothers . ▁▁ ▁Cou ple - to - cou ple ▁mar ri ages ▁were ▁made ▁between ▁the ▁Al ask an ▁Y up ' ik ▁until ▁the ▁early ▁tw enti eth ▁century ▁when ▁Christian ▁mission aries ▁suppress ed ▁the ▁practice . ▁Group ▁marriage ▁was ▁not ▁a ▁standard ▁of ▁Y up ' ik ▁social ▁order ▁but ▁rather ▁a ▁volunt ary ▁rom antic ▁arrangement ▁between ▁established ▁cou ples . ▁ ▁The ▁following ▁instances ▁are ▁c ited ▁in ▁Thomas ▁ 1 9 0 6 . ▁In ▁North ▁America ▁there ▁is ▁" group ▁marriage ▁as ▁existing ▁among ▁the ▁O ma has ▁… ▁ad el ph ic ▁pol yg yn y ." ▁Among ▁the ▁D ieri ▁of ▁Australia ▁exist ▁forms ▁of ▁sp ouse - sh aring ▁known ▁as ▁pir ra uru , ▁in ▁two ▁categories ▁" acc ording ▁to ▁whether ▁or ▁not ▁the ▁man ▁has ▁or ▁has ▁not ▁a ▁t ipp a - mal ku ▁wife . ▁In ▁the ▁first ▁case ▁it ▁is , ▁taken ▁in ▁combination ▁with ▁the ▁t ipp a - mal ku ▁marriage , ▁a ▁case ▁of ▁bil ater al ▁dis similar ▁ad el ph ic ▁( M . ▁and ▁F .) ▁pol yg amy . ▁In ▁the ▁latter ▁case ▁it ▁is ▁dis similar ▁ad el ph ic ▁( t rib