This is an unofficial version of a Massachusetts General Law.
Section 2-102
The intestate share of a decedent's surviving spouse is:
(1) the entire intestate estate if:
(i) no descendant or parent of the decedent survives the decedent; or
(ii) all of the decedent's surviving descendants are also descendants of the surviving spouse and there is no other descendant of the surviving spouse who survives the decedent;
(2) the first $200,000, plus .75 of any balance of the intestate estate, if no descendant of the decedent survives the decedent, but a parent of the decedent survives the decedent;
(3) the first $100,000 plus .5 of any balance of the intestate estate, if all of the decedent's surviving descendants are also descendants of the surviving spouse and the surviving spouse has 1 or more surviving descendants who are not descendants of the decedent;
(4) the first $100,000 plus .5 of any balance of the intestate estate, if 1 or more of the decedent's surviving descendants are not descendants of the surviving spouse.