How can you find out if a deceased relative had a Swiss bank account?

To find out if a deceased relative had a Swiss bank account, you can start by reviewing their financial documents, such as bank statements, tax returns, and estate planning documents that might mention foreign accounts. You may also contact any known banks they used or engage a Swiss attorney or financial advisor who specializes in Swiss banking laws. Additionally, accessing the Swiss Bankers Association's resources or the Swiss Federal Tax Administration may provide guidance on potential unclaimed accounts. Lastly, consider filing a request with the Swiss Banking Ombudsman if you have sufficient information.