Study each of the following case carefully. Briefly state the principle of law and your decision.

The Irvin family had retained Jones as the family accountant for many years. Under the contractual arrangement, Jones paid all bills, provided bookkeeping services, invested family funds and prepared all tax returns for the family. After the family received notice of a tax lien on their personal residence, investigation revealed that Jones had failed to properly prepare the tax returns and had failed to pay bills as directed. Further discovery showed that Jones also made poor investments that caused the family to lose significant amounts of money. Is the Irvin family likely to succeed in their suit against Jones? In addition to accounting malpractice, are there other common law principles of liability in this case?