Morgan Travis Allison's answer There are other possible ways to prove you are an heir. A DNA test comparing your DNA to one of your dad's siblings might work. Also, witnesses could testify to facts that would suggest he was your father. Did he ever say he was, or act like he was? You would have a better case with a birth certificate, of course, but there may be a chance.
Benton R Patterson III's answer The first step would be to approach them yourself to try to work out a deal. If that doesn't work, try having an attorney contact them on your behalf and explain why they are legally obligated to stop using your work and properly compensate you. If that fails, you could sue them for copyright infringement. If you think you may need to sue, you should register your work with the US Copyright Office so that you may recover monetary damages.
Will Blackton's answer That answer will depend on a number of factors, but as it relates to intellectual property law, the first question you have to answer before anyone can possibly respond to your question accurately:
Is this a picture you took (or own the rights to) that is of someone else, or is this a picture taken (and owned) by someone else?
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