Richard - Still it is apparent from a comparison between Fannie and her brother Ferd , via your presentation of their respective "depositions," that what his and his sister's 'knowledge' of their ancestor's war experience, is based upon the statements on that which their mother made to them in this regard.
Gusman - Richard is 50 percent correct and 50 percent incorrect. I quote from the affidavits of Fanny and Ferdinand.
Fanny - "...I DO NOT REMEMBER OF EVERY HEARING HIM SPEAK OF HIS REVOLUTIONARY SERVICES but I have often heard my mother, his daughter...."
Ferdinand - "...that deposed KNEW HIS SAID GRANDFATHER IN HIS LIFETIME; that said grandfather was a revolutionary soldier from the State of New York..."
Incidentally a side thought. If Fanny's memory was hazy or Fanny was lieing or Fanny was part of a conspiracy, Fanny would never have written - "I DO NOT REMEMBER OF EVERY HEARING HIM SPEAK OF HIS REVOLUTIONARY SERVICES" Fanny would have written something more impressive, perhaps "I remember him telling me stories about is experience during the revolution or - I remember him telling me that he was at the Battle of Bunker Hill or whatever story"she might come up with from the Revolution. Fanny's layed back testimony is the very essence of truth told by a lady who was determined not to violate her sworn oath.
What you failed to recognize in the statement that you quoted is that the sworn and notarized affidavits are accepted and dealt with by the Courts as always being truthful in all respects until errors are proven.
Fanny stated that she knew about her grandfathers service from her mother. The judge will have no problem with that statement because it was given under oath. Fanny did not have to hear about her grandfathers service from her father. Fanny's sworn knowledge of his service will translate into fact in Court, unless Doug can conclusive show that Fanny was in error.