You can name only one beneficiary on a savings bond. If you’d like to name two or more beneficiaries, you have to split your bond into multiple parts.
You can report accrued interest from your I Bonds every year but it gets complicated in real life. Keep it simple and go with the default.
You set a second owner or beneficiary when you buy I Bonds in TreasuryDirect. You can still add a joint owner or change the beneficiary at any time.
You can set up a beneficiary or a second owner on your I Bonds in TreasuryDirect. It only depends on if you want to let someone transact on your behalf.