reciprocal, common, shared, mutuality, friendship, cooperation, brotherly, mutuall, reciprocity, fraternal, more...

individual, separate, independent, unilateral, private

joint, joint and survivor, life insurance, more...

our, purely, liberty, old, reciprocal, american, self, small, wor, non, agree

in common,   each other's,   each others,   equally invested,   same understanding,   reciprocal terms