"First responder", a law enforcement officer, a paid, call, reserve or volunteer firefighter, a paid, call, reserve or volunteer emergency medical technician or any other person whose usual and regular duties include rendering assistance at the scene of a crime, accident or other emergency.
"Immediate family member", a spouse, child, step-child, adopted child, sibling, step sibling, adopted sibling, parent, step-parent, legal guardian, adoptive parent, grandparent or grandchild.
Mass. Gen. Laws ch. 271, § 51