Your mother left yourself and sister as heirs to her estate your sister passed away shortly afterwards leaving a husband and two adult children How will the property home left be divided?

If your sister died after she inherited an interest in your mother's home then her share would pass to her heirs according to her will. If she died intestate her interest would pass according the the laws of intestacy. In Massachusetts intestate title to real estate passes according to the laws of Masachusetts even if the decedent lived or heirs live in another state. You should seek the advice of a probate attorney who can confirm who holds legal title to the property.