Most people establish a transfer on death bank account specifically for the purposes of a spouse or a child. However, many beneficiaries of transfer on death accounts can include people beyond a surviving spouse. This can include friends and relatives although there are some states with special rights associated with the surviving spouse.
You need to contact your bank directly to make sure you have the proper form completed with your financial institution. You would also need to return to them if you need to reassign that bank account to someone else. A transfer on death bank account is a better choice than adding someone directly to your bank account since doing the latter would empower that person to do things with your bank account as soon as you add them.
Usually when a transfer on death account agreement directs funds to someone other than the spouse or in addition to the spouse, the spouse might need to give written consent. You will need to read through the specific claim with a transfer on death bank account which you intend to use.
This can be a valuable estate planning tool but certainly should not be the only thing you consider in the process of passing on assets to your loved ones. Make sure that your estate planning lawyer has guided you through the process of considering all possible issues so that you have a comprehensive plan.