Our family's Last Supper picture having come from Scicilly with the signature Tesar on it is worth how much money?

The value of your family's Last Supper picture from Sicily with the signature Tesar can vary widely based on factors such as its age, condition, provenance, and market demand. If it is an original artwork or a limited edition, it could be worth several hundred to thousands of dollars. However, if it's a reproduction or lacks significant artistic merit, its value may be much lower. For an accurate appraisal, consider consulting an art expert or appraiser.