One 'interested' in an action is one who is concerned in the outcome or result thereof because he has a legal right which will be directly affected thereby . . . The 'interest' must be such an immediate and direct claim upon the very subject matter of the action that the intervenor will either gain or lose by the direct operation of the judgment that may be rendered therein. Id. Upon proving the allegations of their motion to intervene, appellants could have legal rights to a preference in the adoptive placement of C. G. L. under provisions in the Indian Child Welfare Act. Appellants' legal rights will be directly affected by the outcome of the adoption hearing. The placement of C. G. L. is the subject matter of the hearing.
Appellants have immediate and direct claims with respect to the child's placement.
Those rights and claims are not represented by existing parties to the action. Respondents in this appeal have filed motions to strike appellants' brief and dismiss their appeal for failure to comply with briefing requirements of Rule 84.04. These motions were taken with the case. Appellants' brief is deficient. It fails to comply with various provisions of Rule 84.04 and, thereby, fails to present any issue for review.