Because your grandmother died without a will—or “intestate” in legal jargon—her property will be distributed according to the formula set out in state law: mostly likely, divided equally among the
surviving four children.
Sometimes this method doesn’t quite seem fair, especially when one of the surviving children has done so much more to care for the parent than the others. But the law just treats all of them equally.
To begin, your mom or one of her siblings should contact the local probate court for the best next steps to take. This court proceeding will also help straighten out the title to the house. In some cases, where there is not a lot of property at stake, survivors can use a simplified procedure, which they can usually handle on their own, without hiring a lawyer for help.
For now, consider that your grandparents have left you a legacy: a hard illustration of what uncertainty you leave behind when you die without a will or other documents specifying how you want your property divvied up.