Many individuals serve as a co-trustee of a trust, such as a family trust holding real estate or a trust of a parent or close friend after their death. Individuals who serve as a co-trustee or, more importantly, are contemplating serving as a co-trustee or successor trustee should be aware of a significant change since the enactment of the Massachusetts Uniform Trust Code ("MUTC") on July 8, 2012, specifically a change concerning the number of trustees that must agree to act when performing their fiduciary duties.