I don't know if this will help but someone has posted an outline descendant tree for Alexandre Dumas at the following address:http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?op=DESCdb=h...
Cut and paste it into your web browser's address slot. Be sceptical of any information you find on the internet. It should only be taken as a starting place.
I know my line of Dumases could not be descended from Alexander but I have gotten interested in the subject. Where is your oldest proven Dumas relative from and do you have an approximate date for his presence there? Once we know something about where your ancestors started we can start making some educated guesses about the likelyhood of your having descended from Alexander.
I haven't run across anyone in North America that has proved their descendancy from Alexandre. If you find anyone, let me know.
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Best of luck, looking forward to hearing from you.