David Deutsch - Where did parents names come from?

Hi,
I have been researching my Deutsch ancestors documents in the Hungarian archives and the LDS archives, and though I have found several Hungarian documents with David - none that listed his parents. Would someone mind sharing where they found that his parents were Jakob and Rosa Neulander?

Since I've seen this tree, I found Jakob's death record, and his 1857 census record, and neither mentioned David. I would love to examine the primary document myself.

thanks!
Daniel Eig (David's great-great-great-grandson)