As per the nomination, on the records of the Company the deceased employee's father is nominated. Post marriage, she ought to have changed/substituted the nomination which was not done. Hence, you may counsel the father and the husband to resolve the dispute amongst themselves. If the Company has received a written demand from the nominee (father) for the gratuity with proof documents, you may deposit the amount payable before controlling authority under the gratuity act, informing of the dispute. Technically company's responsibility will be ceased if it pays the dues to the nominee. However, to avoid disputes, the decision may be left with the authorities.