If someone exercises Undue Influence on someone such as getting them to transfer property, change and account to Joint or execute a Will, the action can generally be nullified.

In Connecticut, Undue Influence is defined as, “the exercise of sufficient control over a person, the validity of whose act is brought in question to destroy his free agency and constrain him to do what he would not have done if such control had not been exercised.” New York has similar rules and definitions.