You had family that was in close proximity to Treblinka during the war, and they talked to you about it?
This is what I was saying--go there, do some investigative research. Getting direct testimony is probably out of the question, but certainly you will find children of people who were direct witnesses. I think it's reasonable to expect many would been told true stories about "transit camp" Treblinka.
This is the kind of positive evidence that is completely lacking from your side, so something like this would be huge for revisionism,
much better for your movement than trying to argue such a case against people that know their shit.
Probably in 1990 after the fall of the USSR revisionists could have gone through the country doing investigative research, talking to locals about specific deportations, etc . a 20 year old in 1942 would be less than 70 in 1990 so they could have gotten great testimony from people showing Jewish resettlement or movement in areas unknown to orthodox history.
I should also point out that the thousands of Germans who claimed to witness holocaust events could also have been interviewed. Revisionists weren't even able to produce an anonymous account of the torture/threats/bribery they believe these people experienced.
Instead Mattogno and co simply delved through ex Soviet archives, finding evidence that was only useful to the other side (eg
labor force reports at the Auschwitz krema)