Is an insurance company required to send a dead beneficiary's share to their children if they were not named as beneficiaries in the policy?

Question Details:

My mom had a life insurance policy to be split 3 ways between me and my siblings. The policy was paid a year late and my brother died during that time period. I was told that the policy would then be split 2 ways but when I received my check I only received 1/3 of the policy and not 1/2 with my brothers share paid out to his kids. His kids were not listed as beneficiaries nor did he leave a Will. Was it legal for the insurance company to pay his kids 1/3 of the policy? the policy was through her employer who didn't inform the insurance company until a year after she had died.

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