How to claim insurance of a deceased husband?

I lost my husband one year back. His company has Group term insurance. as per the last nomination of his insurance, I and my minor kid are nominees. The In-laws are super senior citizens and have enough finances to survive but they want to have more money to transfer to their middle-aged unmarried son, so he doesn't has to work in future. They have investments, gold and properties which will go to him. I struggle every month to pay the home loan EMI, other expenses, normal expenses of me and child from my salary. I informed the company that in-laws are not working but have good financial background and getting an NOC from both the parents is difficult. Now the company is asking to give either NOC from the parents OR a legal heir succession document issued by Judge. The cost & time to procure the said document is beyond my limits. please guide to get the amount in minor kid's name without approaching the In laws to avoid conflict.