Can the property of the decedent go to the spouse instead of the heirs?

You are asking if the spouse can inherit property instead of the heirs. I assume the heirs were listed in a will. In the United States, inheritance is in a state court. Each state has its own law. Without seeing the actual will, I can not comment on it. However it sounds like a mess. In this state it is difficult for a person to disinherit a spouse. I do not know about where you live. I would suggest seeing a local lawyer.