The Finance Buff wrote -If you have two children, you can’t name both of them as 50/50 beneficiaries on the same bond. You’ll have to buy two bonds, one with each child as the beneficiary
What if you didn’t realize this and you only placed one order for $10,000? How do you split your existing $10,000 bond into two $5,000 bonds and name a different child for each half? There’s no direct way to do this in TreasuryDirect, but I figured out an indirect way-using the Custom Linked Account.
Link to full explanation
https://thefinancebuff.com/split-savings-bond-multiple-beneficiaries.html