I know about the PDF report generator, but I need to use RTF instead.
There is PyRTF but it hasn't been updated in a while.
If that doesn't work and you are willing to do some hacking then I can also point you to the GRAMPS Project that has an RTF report generator (look in gramps/docgen/RTFDoc.py). This code is very specific to their genealogy reporting needs, but it is clean and decently documented so could make a good starting point.
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