Showing a lack of testamentary capacity in Massachusetts will and trust litigation is not easy. In Joseph A. Haddad, et. al. v. Marcel A. Haddad, et. al., the Massachusetts Appeals Court recently reversed a decision by the Massachusetts Superior Court by finding that a father who changed his estate planning documents to leave everything to only one of his three sons while likely suffering from the early stages of dementia-did not lack testamentary capacity to do so.