(a) Whenever payment of compensation, in accordance with the terms of this chapter, is made to a widow or widower for her or his use or for her or his use and the use of the child or children, the written receipt thereon of such widow or widower shall release and discharge the employer.

(b) Whenever payment in accordance with the terms of this chapter is made to any employee 18 years of age or over, the written receipt of such person shall release and discharge the employer. In cases where a person under the age of 18 years shall be entitled to receive a sum or sums amounting in the aggregate to not more than $300.00 as compensation for injuries or as a distributive share by virtue of this chapter, the father or mother as natural guardian or the legally appointed guardian of such person shall be authorized and empowered to receive such moneys for the use and benefit of such person and to receipt therefor; and the release or discharge by such father or mother as natural guardian or by the legally appointed guardian shall be in full and complete discharge of all claims or demands of such person thereunder.

(c) Whenever payment of over $300.00, in accordance with the terms of this chapter, is provided for a person under 18 years of age or for a person over 18 who is physically or mentally incapable of earning, the payment shall be made to his duly and legally appointed guardian or to some suitable person or corporation appointed as trustee by the superior court as hereinbefore provided; and the receipt of such guardian or such trustee shall release and discharge the employer.

(d) Payment of death benefits by an employer in good faith to a dependent having a claim inferior to that of another or other dependents shall release and discharge the employer unless such dependent or dependents having a superior claim shall have given notice of his or their claim. In case the employer is in doubt as to the respective rights of rival claimants, he may apply to the board to decide between them.