You need to know at least two things: 1) How your father's assets were titled, (which you can probably check online, in some cases); and 2) whether or not your father left any estate planning. The easiest thing to do would be to ask your father's ex. If you cannot do that, I would try to do a little digging or have an attorney help you to do so. If there are assets in your father's name alone, probate will likely be needed. When that happens, you would be entitled to notice, even if there is a Will or Trust that excludes you.
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I agree with Mr. Frederick. You should have some idea of at least some of your Fr.'s assets. If you look online, you may learn the assets are still in his name or that he has transferred them into the name of someone else. You can use what you learn online to help you with other searches. The lawyer may be of some assistance.
Best of luck.
I am licensed to practice law in Michigan and Virginia and regularly handle cases of this sort. My answering your question does not establish an attorney-client relationship. You should consult a lawyer so you can tell the lawyer the entire situation and get legal advice that is precisely tailored to your case.