I recently graduated from college and am starting a new job next week. I am completing the Retirement Designation Form and would like to list both my married parents equally(50% for each) as Primary Beneficiaries versus one of my parents as the Primary and the other parent as contingent beneficiary. The equal split of my retirement benefits at my death makes more sense to me versus my listing my Father for example as the Primary Beneficiary with a 100% benefit and listing my Mother as the Contingent beneficiary in case my Father passes before my mother does. Is the 50-50 Primary split most commonly done and are there any disadvantages of doing it that way based on my wishes?

Thanks!