Haim Katz - Hachoen Wartski,
Private User makes an excellent point. In fact it was one I had thought of myself, but he beat me to it!
It is clear from earlier discussion that there has been a great deal of confusion, controversy, and debate over who the parents of Abigail Ogla Katzenellenbogen were, with the conclusion being that the identity of her parents is unknown. The reason that some have suggested that she was a Jaffe, as best I can remember seems to be due to a spelling error which caused her to be confused with another woman who had a very similar name, in other words, a simple case of mistaken identity that was understandable and could have easily misled otherwise knowledgeable people.
From the perspective of The Unbroken Chain, so far I have not noticed any names given for her parents (if anyone thinks I missed this, please let me know as I haven't been through the whole 5 volumes yet). I tend to believe that if anyone would know the identity of her parents, it would be Neil Rosenstein and that if he knew who they were, he would have been mentioned them.
Anyway.... the bottom line is that even though Gelles (and many others) may have been wrong about the parentage of Abigail Ogla Katzenellenbogen this does not make him an unreliable source in general. Everyone makes mistakes, and a mistake such as this one seems reasonable and understandable.
Claudia