I also am interested in genealogy. I think whether you could tell or not would depend on many things including the nature of your relationship with your father-in-law. Do you have any evidence besides what the one cousin told you? I was thinking that you could put whatever evidence you had into your genealogy and then give him a copy. He could figure it out for himself and choose whether or not to acknowledge it. If he doesn't figure it out. Oh well. That way it would be a private and personal knowing where it belongs. Good Luck. 
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"It is a great truth and difficult to understand, that the greatest deeds must be done by he, who is content to remain anonymous, lest his action be impeded by too ready acclaim." Anonymous
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