Mass. Gen. Laws ch. 209D, § 2-208

Section 2–208. Child support orders for 2 or more obligees. In responding to registrations or petitions for enforcement of 2 or more child support orders in effect at the same time with regard to the same obligor and different individual obligees, at least 1 of which was issued by a tribunal of another state or a foreign country, a tribunal of the commonwealth shall enforce those orders in the same manner as if the orders had been issued by a tribunal of the commonwealth.