Which document is not required as an attachment on a donor's tax return for a donation made in 2019?

A sworn statement of the relationship of the donor to the donee is not mandated as an attachment on a donor's tax return for a donation made in 2019. The primary purpose of the attachments is to provide verification and validation of the donation made, especially in regard to its value and the nature of the property donated.

The other documents listed, such as a certified true copy of the Certificate of Title for the donated property, the certified true copy of the tax declaration if the property is real, and proof of claimed deductions, serve a crucial role in substantiating the details of the donation. They help ensure that the tax authorities have sufficient information to assess the donation's legitimacy and proper value on the tax return.

In summary, while documenting the relationship between the donor and donee may provide context, it is not essential for verifying the donation itself, which is why it is not required as an attachment for the tax return in this case.