Sorry to hear about your husband.The rules of intestate succession determine inheritance when a person dies without a Will.  Intestate means dying without a Will.  Under intestate succession, the entire estate goes to the surviving spouse.  So, you don't need your childrens' signatures.  If there had not been a surviving spouse, the estate would have been divided equally among your three children.As the surviving spouse, you have inherited your husband's entire estate and can make decisions about the estate which includes the house, without consulting your children.