Q. How much credence can be given to a place of burial of maternal ancestors or pictures taken by the chupa in establishing the Jewish identity of a person?

A. See Orchos Mishpot p. 357 who quotes the general rules established by Horav M. Feinstein, Horav Eliashiv zt”l and others in determining the Jewish Halachic ancestry status of an individual, and which are followed by Batey Din today.
As in the previous answer, Horav Shlomo Miller’s Shlit’a opinion is that there could exist many possible variants, as in regards to the actual guidelines that a cemetery keeps or the validity of pictures taken etc., therefore a competent Rabbinical Authority should be consulted on each case.

Rabbi a. Bartfeld as revised by Horav Shlomo Miller Shlit”a