How do you prove a convenience account?

To prove a convenience account, you typically need to provide documentation that establishes the account's purpose and the relationship between the account holder and the convenience signer. This may include bank statements, account agreements, and any relevant correspondence that demonstrates the account is intended for the convenience of another party, rather than a joint ownership or shared access. Additionally, it's important to show that the funds are primarily controlled by the account holder and that the convenience signer does not have ownership rights.