Do siblings share life insurance payouts?

Life insurance proceeds are payable according to the beneficiary designation made by the insured and that is a part of the insurance policy. As such, the beneficiary can be any person or entity that had an insurable interest in the life of the insured at the time of the policy's inception. Concievably, that can be one or more of the siblings of the person insured. However, the insured is free to change the beneficiary(ies) at any time prior to death.

If the insured designates his/her estate as the beneficiary of the policy, upon death, the proceeds are paid to the estate and distributed per the terms of the deceased's Will. If there is no Will, the proceeds, along with other assets of the estate, are distributed according to the laws of intestate successation of the state in which the insured died.